Answer: D. fusion of hydrogen
Step-by-step explanation:
Nuclear fusion is a process which involves the conversion of two small nuclei to form a heavy nuclei along with release of energy.
Nuclear fission is a process which involves the conversion of a heavier nuclei into two or more small and stable nuclei along with the release of energy.
The reactions which takes place in sun follows a series of equations:
Overall reaction for the above series of reactions is given by:
