33. Which of the following is a key difference between spermatogenesis and oogenesis in humans? (A) Spermatogenesis involves only mitosis, while oogenesis involves only meiosis. (B) Spermatogenesis results in four functional gametes from one precursor cell, whereas oogenesis produces only one functional egg. (C) Oogenesis is a continuous process that begins at adolescence and producing persistently. (D) Primary oocytes complete meiosis II before birth.