[单选题]
How does the total mass ofzg:ewj0 + 1u2lbj y en6;g1b17wubonm thels;sj1 45 o8p3un) ag/8ikrw k-sh gry products of a nuclear fission reaction compare to the mass of the original elemenrurw;8p k5 s/n4ggj31i ) -h 8skoslayts?
A. greater
B. less
C. the same
D. varies according to the reaction
