[单选题]
How does the total m .sw:1o2pcwap ass of the products oun;hd d-/ tzy 3en) lk,2c/fptf a nuclear fission reaction compare to the mass of the original elemn;n d)-2l,p/f kcz3u y/d ethtents?
A. greater
B. less
C. the same
D. varies according to the reaction
