Choose the correct set from the following.
(a) The secondary oocyte completes Meiosis II after fusion of sperm pronucleus.
(b) The primary oocyte completes Meiosis I prior to ovulation.
(c) 60,000 to 80,000 primary follicles are seen in each ovary at the time of birth.
(d) Menarche is a sign of sexual puberty.

(a) Secondary oocyte completes Meiosis II after sperm penetrates into it but, before the fusion of pronuclei. 
(b) The primary oocyte completes Meiosis I prior to ovulation.
(c) 60,000 to 80,000 primary follicles are seen in each ovary at the time of puberty. Many follicles degenerate from birth till puberty.
(d) Menarche is a sign of sexual puberty.