The correct option is
C SpongillaA. Spongia is the costliest Turkish bath sponge.
B. Leucosolenia is a marine, sessile, radially symmetrical, colonial sponge.
C. Spongilla is the most common widely distributed freshwater sponge. It appears green due to presence of symbiotic green alga in it.
D Scypha (Sycon) is the urn sponge or crown sponge.
So, the correct answer is 'Spongilla'.