Answer:
A. Nuclear fusion
Explanation:
The sun generates energy from a process called nuclear fusion. During nuclear fusion, the high pressure and temperature in the sun's core cause nuclei to separate from their electrons. Hydrogen nuclei fuse to form one helium atom.
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I think ionization energy is the energy required to remove an electron from a neutral atom. It is the amount of energy that is required to remove the most loosely bound electron, the valence electron, of an isolated gaseous atom to form a cation. Atoms and molecules have this measurement, which refer to the energy it takes for all atoms in one mole of a substance to each lose one electron.