Answer: Option (D) is the correct answer.
Explanation:
The given reaction is a nuclear fusion reaction because in a nuclear fusion two small nuclei combine together to result in the formation of a large nuclei along with the release of energy.
The complete given reaction will be as follows.
[tex]^{2}_{1}H + ^{3}_{1}H \rightarrow ^{4}_{2}He + ^{1}_{0}n + Energy[/tex]
Thus, we can conclude that along with the release of helium atom there will be release of one neutron and energy.