The appropriate answer is C. SEDIMENTARY rocks. Sedimentary rocks result from the consolidation of sediment. Sediments can be deposited on the ocean floor, on the bottom of a lake or on the banks of a river. As sediments are deposited, the remains of plants and animals can get deposited with the sediments as well. Over time as more layers get deposited the bottom layers will get compacted under the pressure and preserve the outline or the hard parts of plant and animal remains. Igneous and metamorphic rocks are formed under immense heat and pressure and would destroy the plant and animal remains.