Answer:
The correct option is;
![_(1)^(2)\textrm{He} + _(1)^(1)\textrm{H} \rightarrow _(3)^(2)\textrm{He} + energy](https://img.qammunity.org/2021/formulas/physics/high-school/zgm6ao8nduea8ut0t83wijv3u6iosfughe.png)
Step-by-step explanation:
The second step of the fusion process is the reaction (combination) where a Deuterium combines with a hydrogen to produce one helium 3, 3He, nucleus and a energy photon as follows;
![_(1)^(2)\textrm{He} + _(1)^(1)\textrm{H} \rightarrow _(3)^(2)\textrm{He} +\gamma \ (energy)](https://img.qammunity.org/2021/formulas/physics/high-school/15jxd3s6st1h3vox3xdlvevyep82c1f9j1.png)
After which the produced Helium-3 combines to form the Helium nucleus an emit 2 protons
Steps 1 and 2 are take place two times (producing 26 MeV energy) before the step three (the combination of the formed helium-3) takes occurs.