Which one is NOT a mode of action of hormones on their target cell?

Q. Which one is NOT a mode of action of hormones on their target cell?

A.            a hormone may stimulate the synthesis of an enzyme in the target cell.

B.            a hormone may activate an enzyme by altering its shape.

C.            a hormone may deactivate an enzyme by altering its structure.

D.            some hormones are enzymes that promote a chemical reaction in a cell.

Answer: some hormones are enzymes that promote a chemical reaction in a cell.