What would happen if carbon - 14 gained 1 proton and lost 1 neutron?

A) it would stay carbon-14

B) t would become carbon-13

C) it would become nitrogen-14

D) it would become nitrogen-13

D. To answer this question refer to the periodic table and think logically about it. Adding one proton increases the atomic number so you go along the row to Nitrogen. If you lose one neutron then the atomic mass decreases by 1 so 14-1 is 13.