[单选题]
How does the total mass of the pp, tqdul/(m:ow ,iv rt6b)r+zroducts of a nuclear fission reaction h5x5wtx f;ctyxnu2y0iq r)* )compare to the m5c2wtfr ;x y) quh* n5ixxy)0tass of the original elements?
A. greater
B. less
C. the same
D. varies according to the reaction
