Which of These Statements Refers to the Permissiveness of Hormones

Which of these statements refers to the permissiveness of hormones

A) Hormones permit cellular processes to occur.
B) Hormones permit their target organs to function at the optimal rate.
C) In some instances, an adequate amount of one hormone must be present for the full exertion of another hormone's effect.
D) Through numerous neuroendocrine relationships, the nervous system allows the endocrine system to function.