Correct Answer: Nuclear fusion

Solution : The correct answer is Nuclear fusion .

Solar energy encompasses all forms of energy produced by the sun. The sun undergoes nuclear fusion, which produces solar energy. Fusion is the process by which protons from hydrogen atoms clash forcefully to form helium atoms at the centre of the sun. This process is known as fusion. This mechanism, known as a proton-proton (PP) chain reaction, releases an enormous amount of energy.