Select the True Statement Related to the Factors That Stimulate

Select the true statement related to the factors that stimulate the hypothalamus to secrete corticotropin-releasing hormone.

A) The circadian rhythm is the very finely tuned control that maintains the day-to-day levels of cortisol at relatively constant amounts.
B) The sleep-wake cycle is the very finely tuned control that maintains the day-to-day levels of cortisol at relatively constant amounts.
C) Negative feedback is the very finely tuned control that maintains the day-to-day levels of cortisol at relatively constant amounts.
D) All of these are correct.