Solution

Phylum Coelenterata (cnidaria) includes tentacle bearing, aquatic, acoelomate, diploblastic, radially symmetrical animals. The phylum Cnidaria is characterized by following characters:
(1) Members are mostly marine.
(2) Usually radially symmetrical in the adult stage.
(3) possess tissue level of body organization.
As the given characters represent the phylum Coelenterata (Cnidaria), Thus the option C is the correct answer.