The menstrual cycle can be divided into three continuous phases. Starting from the first day of the cycle, their consecutive order is
(a) menstrual, proliferative, secretory,
(b) menstrual, secretory, proliferative,
(c) secretory, menstrual, proliferative,
(d) proliferative, menstrual, secretory,
(e) secretory, proliferative, menstrual.