Identify A, B, C in order in the picture - What happens at the point D (choose the appropriate option) :

Question

( a ) Menstrual phase, Follicular or proliferative phase, Luteal or secretory phase; LH surge followed by ovulation
( b ) Menstrual phase, Luteal phase, secretory phase; ovulation
( c ) Menstrual phase, follicular phase, secretory phase; LH surge
( d ) Menstrual phase, Luteal phase, secretory phase; LH surge