To which stages A, B corresponds ? When is B completed? What are the values of x, y, z ?

Question

( a ) Mitosis & differentiation, 1st meiotic division; completed prior to ovulation; x = 46, y = 23, z = 23
( b ) Mitosis & differentiation, 2nd meiotic division; completed prior to ovulation; x = 46, y = 23, z = 23
( c ) Mitosis, 1st meiotic division; completed prior to fertilisation; x = 46, y = 46, z = 23
( d ) Mitosis & differentiation, 2nd meiotic division; completed at birth; x = 46, y = 23, z = 23