Use the Graph Below, Which Shows Changes During the Menstrual $A$

Use the graph below, which shows changes during the menstrual cycle, to answer the following Questions

-The increase shown at point $A$ is caused by the effect of

A) estrogen on the anterior pituitary
B) progesterone on the hypothalamus
C) follicle-stimulating hormone (FSH) on the ovary
D) luteinizing hormone (LH) on the anterior pituitary
E) prolactin on the ovary