[单选题]
In all three types of rad xlrls1. p8nfsg7* wv+ioactive decay, what value is conserved in addition z(.shi q3y3z(z 2nahje gei8n*:sa9 tto electric 3s2 qh.89 n(g:z(js*htn zy 3eeazi iacharge, energy, and momentum?
A. atomic number
B. neutron number
C. nucleon number
D. none of the given answers
