Discussion
The sun releases energy by :
Answer: B
The Sun releases energy by Nuclear fusion.
In the Sun's core, at about 15 million K, hydrogen nuclei fuse through the proton-proton chain to form helium. The helium nucleus has slightly less mass than the four protons that made it, and that missing mass becomes energy by \(E = mc^{2}\), about 4 million tonnes of mass converted every second.
Nuclear fission, splitting heavy nuclei such as uranium, powers reactors on Earth, not stars. Combustion is a chemical reaction that would have exhausted a Sun-sized fuel store in a few thousand years. Hydrothermal processes involve hot water in the Earth's crust.
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