Question

just prior to ovulation, the egg is inside the _____.
a polar body
b corpus luteum
c immature follicle
d mature follicle

Explanation:

Ovulation is the release of a mature egg from the ovary. Before this event, the egg develops and is contained within a mature (graafian) follicle. A polar body is a byproduct of egg cell division, the corpus luteum forms after ovulation, and an immature follicle is an early stage before the egg is ready for ovulation.

Answer:

d. mature follicle