The Key Difference That Distinguishes the Menstrual Cycle from an Estrous

Multiple Choice

The key difference that distinguishes the menstrual cycle from an estrous cycle is that

A) the estrous cycle is longer than the menstrual cycle.
B) females can only mate around the time of ovulation in the menstrual cycle.
C) there is no cycle of growth/loss of the uterine lining in the estrous cycle.
D) the estrous cycle does not involve the secretion of estrogens.
E) females can mate at any time during the estrous cycle.