[单选题]
How does the total mu k4a qbam1b(1g h8um ny7:z*eascfywk3+vykh(k :h36hs of the products of a nuclear fission reaction compare to the mass of the orikh f(khkyy3vc3+ hw6:ginal elements?
A. greater
B. less
C. the same
D. varies according to the reaction
