Answer:
I believe it is the first one.
Step-by-step explanation:
I would've said the last one but it does not describe how fossils are exposed to the surface and nor are fossils necessarily that CLOSE to the surface. Some fossils are really deep, so the last one is too generalized to be true. I think it is the first one because, like I said, this answer specifies how fossils are exposed through the weathering and erosion of topical elements to over time allow fossils to come to the surface for geologists to discover. Hope that helps :)