The dioecious animal is
Dioecious animals are those animals in which male and female reproductive organs are present in separate individuals. For example, Cnidarians like Aurelia are dioecious.
Monoecious animals, on the other hand, are those animals which are having both the male and female reproductive organs in the same individual, they are also known as hermaphrodites. For example, Liverfluke, Tapeworm and earthworm. Hence, the option B is correct.