Read the given passage and answer the questions that follow :- The primary sex organs ,the testis in the males and ovaries in the females produce gametes i.e, sperms and ovaries respectively by the process called gametogenesis. Sperm is a motile gamete whereas the ovum is a non-motile gamete. Sperm and ova formation are called spermatogenesis and oogenesis respectively.

When does oogenesis start?

Onset of puberty. Immediately after parturition . After 15 years of birth. During embryonic development stage.

During embryonic development stage.

Oogenesis starts during embryonic development stage.