In the Nuclear Reaction $^{3}_{1} H + ^{3}_{1} H → X + ^{4}_{2} He$

In the nuclear reaction $^{3}_{1} H + ^{3}_{1} H → X + ^{4}_{2} He$ , what is X?

A) 2 protons
B) 2 neutrons
C) ²H
D) ³H
E) alpha particle