Given below are four statements $(A - D)$ each with one or two blanks. Select the option which correctly fills up the blanks in two statements:
$A.$ The human male ejaculates about $(i)$ $200-300$ million sperms during a coitus. Out of which, for normal fertility at least $(ii)$ $60$ percent sperms must have normal shape and size.
$B.$ $A$ primary spermatocyte completes $(i)$ first meiotic division leading to the formation of two equal haploid cells called $(ii)$ secondary spermatocytes.
$C.$ Spermatogenesis starts at the age of $(i)$ puberty due to significant increase in the secretion of $(ii)$ $GnRH$, a hypothalamic hormone.
$D.$ Oogenesis is initiated during embryonic development and at puberty only $(i)$ $60,000-80,000$ primary follicles are left in each ovary.

• A
  $A - (i): 200-300; (ii): 40$; $B - (i): \text{Second}; (ii): \text{Spermatids}$
• B
  $A - (i): 200-300; (ii): 40$; $D - (i): 60,000-80,000$
• C
  $B - (i): \text{First}; (ii): \text{Secondary spermatocytes}$; $C - (i): \text{Puberty}; (ii): GnRH$
• D
  $C - (i): \text{Puberty}; (ii): \text{Gonadotropins}$; $D - (i): 60,000-80,000$