Write the Appropriate Letter (A

Write the appropriate letter (a.,b., or c.) in the blank.(Options may be used more than once or not at all.)
a.A is greater than B.
b.B is greater than A.
c.A and B are approximately equal.
a.the length of the luteal phase of the average menstrual cycle ____
B.the length of the follicular phase of the average menstrual cycle
a.the number of chromosomes in the ovulated secondary oocyte ____
B.the number of chromosomes in a primary oocyte
a.the number of primary follicles present in the ovary at any time during the menstrual cycle____
B.the number of mature follicles just before ovulation
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.plasma concentration of progesterone during the follicular phase of the ovarian cycle ____
B.plasma concentration of progesterone during the luteal phase of the ovarian cycle