What general conclusion is drawn from the depth at which fossils are found?

Correct answer: Fossils in deeper layers are generally older

The relevant principle is relative dating of sedimentary rock layers. When undisturbed layers accumulate, lower layers were deposited earlier and upper layers later. Consequently, fossils preserved in deeper layers are generally older than fossils in layers above them. Option A expresses this conclusion. The word “generally” is important because geological disturbance can overturn or mix layers, so “always” in option B is too absolute.