The correct option is C Sphagnum
Among the bryophytes, Sphagnum is considered by far the most critical place economically. It is popularly called bog moss or peat moss. The increasing mass of dead remains accumulate year after year and form a compact dark-colored mass rich in carbon called peat. Peat is used as fuels and as a packing material.
Marchantia and Polytrichum has medicinal properties. Riccia grows on damp soils and is commonly used in aquariums.