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Solar energy is mainly caused due to:

1. gravitational contraction
2. burning of hydrogen in the oxygen
3. fission of uranium present in the Sun
4. fusion of protons during synthesis of heavier elements

Correct answer: fusion of protons during synthesis of heavier elements

Solution

The Sun's energy is primarily produced by nuclear fusion, where protons (hydrogen nuclei) combine to form helium and release energy in the process.

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