The correct option is C Leech, Hydra, Tapeworm
If both male and female sexual organs are present in the same organism, the organism is called a hermaphrodite. In the given options, Hydra, Pheretima, Leech and Tapeworm are hermaphrodite. But Ascaris and Schistosoma are not hermaphrodite as their sexes are separate. So the group contains all hermaphrodite animals are Leech, Hydra, Tape worm.