Self-fertilisation is fertilisation of plants and some invertebrate animals by ir own sperm rar than that of anor individual. It occurs in bisexual animals as in flatworms and molluscs but though earthworm has both male and female sex organs, y cannot self-fertilize because sperms and ova mature at different time. Thus, correct answer is option D.

Oviparous animals are those organisms that lay eggs, with little or no or embryonic development within mor. In some oviparous animals, fertilization is external (in fishes, most of frogs) while in some fertilization is internal, female lays zygotes as eggs (typically birds).

Reproduction is a biological process carried out by organisms in order to keep ir species alive. It is a process carried out generation after generation. There are many ways of reproducing. They are divided into sexual and asexual reproduction.