[单选题]
A nuclear reaction is said to be exothermic iy8zf 9kfe+es4xdi2m . f the total kinesnpxxj+ nf2uk6 d /;k,* 5imcttic energy is
A. less after the reaction than before.
B. equal both before and after the reaction.
C. greater after the reaction than before.
D. zero after the reaction.