(A) is the right answer.
Five modes of reproduction can be differentiated in animals based on relations between zygote and parents. Ovoviviparity is one of them. Ovoviviparity: this is oviparity with retention of zygotes in the female’s body or in the male’s body, but without major trophic interactions between zygote and parents (there may be minor effects, such as maintenance of water and oxygen levels). Anguis fragilis is an example of ovo-viviparity. In seahorses, zygotes are retained in the male’s ventral "marsupium". In the frog Rhinoderma darwinii, the zygotes develop in the vocal sac. In the frog Rheobatrachus, zygotes developed in the stomach.