What is the third step of the hydrogen fusion process?

The third step is the recombination of two Helium-3 atoms

Explanation:

In the fusion cycle of Hydrogen, there are basically three major steps –  

Step 1 – Hydrogen fuses into deuterium.  

In this process two proton collide to form a neutron that emits an antielectron and a neutrino.

Step 2-  Formation of Helium-3

In this step a deuterium captures a proton thereby causing emission of photon and formation of  a 3He nucleus

Step 3- Recombination stage

Here, two Helium-3 atoms recombine to form one nucleus of Helium thereby releasing two protons.

correct answer is a. and d.

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