Concept:Organic rocks are formed from the remains of plants and animals.
Explanation:The rock types listed belong to different sedimentary groups.
Gypsum is a chemical sedimentary rock formed by evaporation of water rich in calcium sulphate.
Grit is a clastic sedimentary rock made of coarse sand grains.
Shale is a clastic sedimentary rock composed of compressed clay and silt particles.
Coal, however, is an organic sedimentary rock.
It forms from the accumulation, burial, and lithification of plant debris in swampy environments.
Answer:B. Coal