Final answer:
The correct fusion reaction is option c, where Hydrogen-2 and Hydrogen-3 combine to form Helium-4 and a neutron.
Step-by-step explanation:
The fusion reaction among the given options is c) Hydrogen-2 and hydrogen-3 combining to form a helium-4 atom and a neutron. This process is a classic example of nuclear fusion, where two light nuclei merge to form a heavier nucleus. In contrast, option a) is a fission reaction where a heavy nucleus splits into lighter nuclei after absorbing a neutron, and option b) is a chemical reaction, which is not related to nuclear reactions.