To solve this problem, we need to determine at which stage of life the oogenesis process is initiated.$\newline$Oogenesis is the process of formation of the female gametes, or ova, in the ovaries.$\newline \bullet$Oogenesis begins during the embryonic development stage.$\newline \bullet$In females, the primordial germ cells migrate to the developing ovaries and differentiate into oogonia.$\newline \bullet$These oogonia undergo mitotic divisions and enter the first meiotic division to become primary oocytes.$\newline \bullet$The primary oocytes are arrested in prophase I of meiosis until puberty.$\newline$Therefore, the initiation of oogenesis occurs during the embryonic development stage.$\newline$This corresponds to Option 2: Embryonic development stage.