[单选题]
In all three types of radioactive decay, what value is cmz;2 5kbaxig0 onserved i1d1* vy2e nho4z+ckfmn addition to electric charge, ener1vn*c1 y4ho fkd2m+zegy, and momentum?
A. atomic number
B. neutron number
C. nucleon number
D. none of the given answers
