Write the Appropriate Letter in the Blank by Using the Following

Multiple Choice

Write the appropriate letter in the blank by using the following answer code to indicate the relative magnitude of the two items in question.
-A. Plasma concentration of estrogen during the follicular phase of the ovarian cycle.
B. Plasma concentration of estrogen during the luteal phase of the ovarian cycle.

A) A is greater than B.
B) B is greater than A.
C) A and B are approximately equal.