Relaxin hormone is produced from

Which one of the following statements with regard to embryonic development in humans is correct?

In Human beings, at the end of $12$ weeks (first trimester) of pregnancy, the following is observed 

Assertion : During fertilization only head of spermatozoa enters egg.

Reason : If several spermatozoa hit the egg at same time, all can enter the egg.

The given figure shows the human foetus within the uterus with few structures marked as $A,\,B,\,C$ and $D$.

Which of the following options shows the correct labeling ?