A Nuclear Reaction Is Shown ${ } _ { 5 } ^ { 10 } \mathrm {~B} + { } _ { 2 } ^ { 4 } \mathrm { He } \rightarrow { } _ { 1 } ^ { 1 } \mathrm { H } + ?$

A nuclear reaction is shown: ${ } _ { 5 } ^ { 10 } \mathrm {~B} + { } _ { 2 } ^ { 4 } \mathrm { He } \rightarrow { } _ { 1 } ^ { 1 } \mathrm { H } + ?$ . Which one of the following isotopes is the missing nuclear product?

A) ${ } _ { 7 } ^ { 21 } \mathrm {~N}$
B) ${ } _ { 9 } ^ { 12 } \mathrm {~F}$
C) ${ } _ { 7 } ^ { 14 } \mathrm {~N}$
D) ${ } _ { 7 } ^ { 13 } \mathrm {~N}$
E) ${ } _ { 6 } ^ { 13 } \mathrm { C }$