Which Describes the Action of Aromatase Inhibitors

Which describes the action of aromatase inhibitors?

A) Block the estrogen receptors that stimulate the growth of ER-positive tumors
B) Block an enzyme that catalyzes the final step in the synthesis of estrogen
C) Suppress the ovary and adrenal gland from producing estrogen
D) Weaken the effect of estrogen on ER-positive tumors