which type of fossils form from hardening sediment? casts tar pit fossils carbon films amber fossils

Brief Explanations:

Casts form when sediment hardens around a buried organism and then the organism decays, leaving a hardened sediment - based mold. Amber fossils form from tree resin, carbon films from the carbon - rich remains of organisms, and tar pit fossils from organisms trapped in tar.

Answer:

D. casts