Question

the images show sedimentary layers before and after they were shifted by a geologic event. after the geologic event, which layer is the oldest? layer a layer b layer c layer d

Explanation:

In sedimentary rock layers, the principle of superposition states that in undisturbed sedimentary sequences, the oldest layer is at the bottom. Even after a geologic event (like tilting), the relative ages of the layers do not change. Layer A was the bottom - most layer before the geologic event, and its relative age (oldest among A, B, C, D) remains the same after the event.

Answer:

layer A