During the proliferative phase, the follicles start developing, hence it is called the follicular phase. The secretory phase is also called the luteal phase, mainly controlled by progesterone secreted by the corpus luteum. Estrogen further thickens the endometrium, maintained by progesterone. Menstruation occurs due to decline in progesterone level and involves breakdown of the overgrown endometrial lining. Correct match: a-ii, b-iii, c-i.