[单选题]
In a nuclear reaction, what value is conserved in additpcuvco5 0h vd6xax9b8*gla; rslyw5gl/ 7l*.8ovt+f u6u dbu ctsx1 0gfus3b2a;r,( ion to electric charge, energy, and mr,uc 26f3 dt (;avbbxo01tsf8+usuugomentum?
A. atomic number
B. neutron number
C. nucleon number
D. none of the given answers
