Fertilization is complete when -
Ans. is 'b' i.e., 2nd Polar body is formed "As soon as a spermatozoon enters the ovum, the lather finishes its second meiotic division and the second polar body is formed" - I.B. Singh
1st Polar body is formed
2nd Polar body is formed
Primary oocyte is formed
Secondary oocyte is formed
Sex Hormones