In humans female, oogenesis is initiated_________.

The correct answer is Option (1) → During embryonic development

Option (1) During embryonic development — Correct. A couple of million oogonia form in each fetal ovary, and no more are added after birth.

NCERT Extract:
Gametogenesis – “… The process of formation of a mature female gamete is called oogenesis which is markedly different from spermatogenesis. Oogenesis is initiated during the embryonic development stage when a couple of million gamete mother cells (oogonia) are formed within each fetal ovary; no more oogonia are formed and added after birth. These cells start division and enter into prophase-I of the meiotic division and get temporarily arrested at that stage, called primary oocytes.”