Sedimentary rocks are formed by the deposition and successive cementation of material at the Earth’s surface and within bodies of water. They form layers called strata which can be seen in exposed cliffs. Example of sedimentary rocks includes limestone, sandstone, mudstone, greywacke, chalk, coal, claystone and flint. Limestone from metamorphic rock marble when subjected to extreme heat and pressure over time. Sandstone forms the metamorphic rock quartzite. Mudstone forms the metamorphic rock slate. Flint is a hard, sedimentary form of the mineral quartz. The answer is letter C.