[单选题]
In all three types of radioactive decay, what value is conserw jy+k/s o7b5 b)k/irrve95 ondxml5cha) )ur+ti* lys.d in addition to rht5n.d *lcx+o l9)s)5i ymuaelectric charge, energy, and momentum?
A. atomic number
B. neutron number
C. nucleon number
D. none of the given answers
