Use the Following to Answer Questions

Use the following to answer questions:
Refer to the graph below, depicting the average blood concentrations of three circulating hormones in 100 healthy adult women. Each hormone plays a role in regulating some aspect of the ovarian and/or uterine cycle.
-Based on the graph, which of the following statements is true?

A) Curve A represents estrogen levels.
B) Curve B represents progesterone levels.
C) Curve C represents a hormone secreted from the anterior pituitary gland.
D) Curve C represents a hormone that is produced by the corpus luteum.
E) Both a and d