Which of the following is the fusion reaction ?

${ }_1 H^2+{ }_1 H^2 \rightarrow {}_2 H e^4$

${ }_0 n^1+{ }_7 N^{14} \rightarrow {}_6C^{14}+{ }_1 H^1$

${ }_0 n^1+{ }_{92} U^{238} \rightarrow{ }_{93} N p^{239}+\beta^{-1}+\gamma$

${ }_1 H^3 \rightarrow{ }_2 H e^3+\beta^{-1}+\gamma$