[单选题]
How does the total mass of the product/to -n2tb, hcjs of a nuco3ja hir*x g / bm-51w5wowiz0lear fission reaction compare to the mass of the originawwgao- * z1o ij 3i55rbx/0hmwl elements?
A. greater
B. less
C. the same
D. varies according to the reaction
