The Nuclear Reaction(s)that Is(are)most Likely to Be Employed in Fusion

The nuclear reaction(s) that is(are) most likely to be employed in fusion reactors on Earth is(are)

A) ${ } _ { 1 } ^ { 2 } \mathrm { H } + { } _ { 1 } ^ { 2 } \mathrm { H } \rightarrow { } _ { 2 } ^ { 3 } \mathrm { He } + { } _ { 0 } ^ { 1 } \mathrm { n }$ .
B) ${ } _ { 1 } ^ { 2 } \mathrm { H } + { } _ { 1 } ^ { 2 } \mathrm { H } \rightarrow { } _ { 1 } ^ { 3 } \mathrm { H } + { } _ { 1 } ^ { 1 } \mathrm { H }$ .
C) ${ } _ { 1 } ^ { 2 } \mathrm { H } + { } _ { 1 } ^ { 3 } \mathrm { H } \rightarrow { } _ { 2 } ^ { 4 } \mathrm { He } + { } _ { 0 } ^ { 1 } \mathrm { n }$ .
D) all of the above.
E) only (a) and (b) above.