In This Graph of Estrogen and Progesterone in the Female

Multiple Choice

In this graph of estrogen and progesterone in the female reproductive cycle, the center dotted line represents day 14. Which of these is true?

A) The peak 1 shows the surge that causes breakdown of the uterine lining.
B) The peak 2 is brought about in response to high levels of FSH.
C) The peak 2 causes complete buildup of the uterine lining (endometrium) .
D) The two hormonal peaks ensure that fertilization will not occur.