The molecules secreted by activated b cells are part of the:\nOptions:\n- (A) immune system\n- (B) Organic compounds\n- (C) Energy.\n- (D) an organism's body\n- (E) acetic acid\n- (F) harmful substances\n- (G) Chemical energy\n- (H) Veins and arteries.
Let's be accurate as possible. Think before you answer.
(A)
Plasma cells are activated B cells that secrete antibodies.

Antibodies are manufactured by the immune system.

Plasma cells are activated B cells that secrete immune system molecules.

.

Thus, the answer is (A)