Although Females Are Born with Approximately 2 Million Ova, This

Although females are born with approximately 2 million ova, this number declines to about __________ by puberty, and, on average, only __________ of the ova will mature during a woman's childbearing years.

A) 500,000; 600
B) 400,000; 500
C) 300,000; 400
D) 200,000; 300