Answer:
B sedimentary.
Fossils are typically found in sedimentary rocks, which are formed from layers of sediment (such as sand, silt, and clay) that accumulate over time and then harden into rock. The remains of plants and animals that are preserved in these layers of sediment eventually become fossils. Metamorphic rocks are formed when existing rocks are subjected to intense heat and pressure, which can change their composition and texture. Igneous rocks are formed from the solidification of molten magma or lava. Concrete is a human-made material composed of cement, water, and aggregates such as sand and gravel.