Which of the following events is observed during the flow phase of menstrual cycle? 

A. A follicle matures and an egg cell is released from it.

B. Uterine lining collapses and moves out of the body as menstruation.

C. Uterine lining thickens in preparation for the expected pregnancy.

D. There is a repair of uterine lining and growing of follicles.

​