most investigators use photography and video recordings to try to capture images of ghosts. they will often leave cameras running for a long period of time.
which sentence best paraphrases the passage above?
investigators often leave cameras running for a long period of time to try to capture images of ghosts.
paranormal investigators often try to capture images of ghosts.
investigators may use photography and video recordings to try to capture images of ghosts, leaving cameras running for a long period of time.
paranormal investigators will leave cameras on while they are gone in order to get an actual picture of a ghost.

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# Brief Explanations:
To paraphrase, we need to retain the key information: investigators use photography/video to capture ghost images and leave cameras running long. The first option combines the two sentences but the original says "most investigators" use photography/video (not just leaving cameras), but wait, no—wait, the original has two parts: using photography/video to capture ghosts, and leaving cameras running long. Wait, no, the original is: "Most investigators use photography and video recordings to try to capture images of ghosts. They will often leave cameras running for a long period of time." So the paraphrase should combine these two ideas. Let's check each option:

- First option: "Investigators often leave cameras running for a long period of time to try to capture images of ghosts." But the original says they use photography and video (which includes leaving cameras running? Wait, no—using photography/video to capture, and also leaving cameras running long. Wait, maybe the first option is combining the purpose (capture ghosts) with the action (leave cameras running long). Wait, but the original's two sentences: first, they use photo/video to capture ghosts; second, they leave cameras running long. So the paraphrase should include both: using photo/video to capture ghosts, and leaving cameras running long. Wait, the first option: "Investigators often leave cameras running for a long period of time to try to capture images of ghosts." So here, the "to try to capture..." is the purpose of leaving cameras running. But the original's first sentence is about using photo/video (which includes cameras) to capture ghosts, and the second is that they leave cameras running long. So the first option combines the purpose (capture ghosts) with the action (leave cameras running long), which is a good paraphrase. Wait, but let's check the other options:

- Second option: "Paranormal investigators often try to capture images of ghosts." But the original mentions using photography/video and leaving cameras running, which this option omits. So not a good paraphrase.

- Third option: "Investigators may use photography and video recordings to try to capture images of ghosts, leaving cameras running for a long period of time." The "may" is not in the original (original says "most investigators use..."), so "may" changes the meaning. So this is incorrect.

- Fourth option: "Paranormal investigators will leave cameras on while they are gone in order to get an actual picture of a ghost." The original doesn't mention "while they are gone" or "actual picture", so this adds new info. So incorrect.

Wait, maybe I made a mistake. Let's re-examine. The original: "Most investigators use photography and video recordings to try to capture images of ghosts. They will often leave cameras running for a long period of time." So the two actions: using photo/video to capture ghosts, and leaving cameras running long. The first option: "Investigators often leave cameras running for a long period of time to try to capture images of ghosts." So here, the "to try to capture..." is the purpose of leaving cameras running, which aligns with the original: they use photo/video (which involves cameras) to capture ghosts, and part of that is leaving cameras running long. So this option combines the two sentences into one, showing the purpose (capture ghosts) and the action (leave cameras running long). The other options either omit details (second, fourth) or add incorrect info (third, "may"). So the first option is the best paraphrase.

Wait, but let's check again. The original's first sentence: "Most investigators use photography and video recordings to try to capture images of ghosts." The second: "They will often leave cameras running for a long period of time." So the first option: "Investigators often leave cameras running for a long period of time to try to capture images of ghosts." So here, the "to try to capture..." is the purpose of leaving cameras running, which is consistent with the original: they use cameras (via photo/video) to capture ghosts, and they leave cameras running long (as part of that process). So this option combines the two sentences into a single sentence with the purpose stated as the infinitive. So this is a good paraphrase.

# Answer:
A. Investigators often leave cameras running for a long period of time to try to capture images of ghosts.

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