Question

Which is a site where sedimentary rocks form?

A.
deep underground

B.
forests

C.
volcanoes

D.
ancient seas

Answer 1

I think it is D. ancient seas

Answer 2

I believe it's D too like @sklopr said cuz sediment is often formed when weathering and erosion break down a rock into loose material in a source area

Answer 3

Yes I would also go with D. Since sediment is usually formed in bodies of water.

Btw, you'd get way more responses if you moved this to the Science section :)