the diagram shows horizontal rock layers. which statement is accurate?
○ layer c is younger than layer a.
○ layer d has an older relative age than layer c.
○ if a geologic event tilted these layers, layer b would no longer be the oldest.
○ it is possible to determine the absolute age of layer c with the information given.

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# Brief Explanations:
- For "Layer C is younger than layer A": In horizontal rock layers (principle of superposition), older layers are at the bottom, younger at the top. Layer A is below C, so A is older, C is younger? Wait, no—wait, the layers from bottom (oldest) to top: A (bottom), then B, then C, then D (top). So A is oldest, then B, then C, then D (youngest). So Layer C is above A, so C is younger than A? Wait, no—wait, the order from bottom (oldest) to top (youngest) is A (bottom), B, C, D (top). So A is oldest, B next, C next, D youngest. So "Layer C is younger than layer A" would be true? Wait no, wait the options: let's re-examine.

Wait the options:

1. Layer C is younger than layer A: Since A is below C (A is at the bottom, C is above B which is above A), so A is older, C is younger. So this would be true? Wait no, wait the other options:

2. Layer D has an older relative age than layer C: D is above C, so D is younger than C. So this is false.

3. If a geologic event tilted these layers, layer B would no longer be the oldest: The oldest layer is the bottom one, A. So B is not the oldest. Wait, original layers: A (bottom, oldest), B, C, D (top, youngest). So B is not the oldest. So tilting would not change the relative ages (the bottom layer is still the oldest, even if tilted). So this statement is wrong.

4. It is possible to determine the absolute age of layer C with the information given: Absolute age needs radiometric dating or other methods, which we don't have here (only relative layers). So this is false.

Wait, maybe I messed up the layer order. Let's look at the diagram: the layers are A (pink, bottom), B (light blue, above A), C (light purple, above B), D (orange, above C). So from bottom (oldest) to top (youngest): A, B, C, D. So A is oldest, then B, then C, then D (youngest).

So:

- Option 1: Layer C is younger than layer A. Since A is below C (A is older, C is younger), this is true? Wait, but wait, maybe I got the layers reversed. Wait, in sedimentary rock layers, the oldest is at the bottom. So A is bottom, so oldest. Then B, then C, then D (youngest). So C is above A, so C is younger than A. So this would be true? But wait, let's check the other options again.

Wait option 3: "If a geologic event tilted these layers, layer B would no longer be the oldest." But originally, B is not the oldest (A is oldest). So tilting the layers doesn't change which is oldest (the bottommost layer, even if tilted, is still the oldest). So this statement is wrong.

Option 2: Layer D has older relative age than C. D is above C, so D is younger. So false.

Option 4: Absolute age of C. We only have relative layers, no absolute dating info. So false.

Wait, but maybe I made a mistake. Wait the first option: "Layer C is younger than layer A." Since A is below C, A is older, C is younger. So this is true? But let's check again.

Wait the diagram: A is the bottom layer (pink), then B (light blue), then C (light purple), then D (orange). So the order from oldest to youngest is A, B, C, D. So C is younger than A (since A is older, C is above A, so formed later). So this statement is accurate. Wait, but maybe the options are different. Wait the user's options:

Wait the options are:

- Layer C is younger than layer A.

- Layer D has an older relative age than layer C.

- If a geologic event tilted these layers, layer B would no longer be the oldest.

- It is possible to determine the absolute age of layer C with the information given.

So let's analyze each:

1. Layer C is younger than layer A: Correct, because in horizontal layers, lower layers are older. A is lower than C, so A is older, C is younger.

2. Layer D has older relative age than C: D is above C, so D is younger. So false.

3. If tilted, layer B would no longer be the oldest: Original oldest is A (not B). Tilting doesn't change the relative age order (the bottom layer, even tilted, is still the oldest). So B was never the oldest, so this statement is false.

4. Absolute age of C: We need radiometric dating or other methods, which aren't provided. So false.

Thus, the accurate statement is "Layer C is younger than layer A." Wait, but wait, maybe I got the layers reversed. Wait, maybe the layers are A (top) and D (bottom)? No, the diagram shows A at the bottom (pink), D at the top (orange). So the order is A (bottom, oldest), B, C, D (top, youngest). So yes, C is younger than A.

Wait, but let me confirm the principle of superposition: in undisturbed sedimentary rock layers, the oldest layers are at the bottom, youngest at the top. So here, the layers are horizontal (undisturbed), so A (bottom) is oldest, D (top) is youngest. So C is above A, so C is younger than A. So that statement is accurate.

# Answer:
Layer C is younger than layer A.

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