It most commonly forms in clear, warm, shallow marine waters. It is usually an organic sedimentary rock that forms from the accumulation of shell, coral, algal, and fecal debris. It can also be a chemical sedimentary rock formed by the precipitation of calcium carbonate from lake or ocean water
One is B, two is C, and I'm not sure but I think three is A or C.
im pretty sure its B.
but i know its not A. or D. because those are nonrenewable
but it is possible that it is C.