Correct Option: B

The cycling of elements in an ecosystem are called Biogeochemical cycles. They have two components; 1-Biotic and 2-Reservoir. On the basis of location of reservoir, Biogeochemical cycle are of three types-(A) Gaseous cycle e.g., C,H and O cycle, (B) Sedimentary cycles e.g., P and S cycles (C) Hydrological cycle (H₂O cycle).