Which Statement About Animal Defense Systems Is True

Which statement about animal defense systems is true?

A) Innate defenses act slowly.
B) During the effector phase of a defensive response, an effector discriminates between self and nonself.
C) Innate defenses evolved after adaptive defenses.
D) Animal defense systems are based on differentiating between self and nonself molecules.
E) During the activation phase of a defensive response, cells and molecules destroy the invader.