Discussion
Thermonuclear reactions are responsible for energy production in :
Answer: D
Thermonuclear reactions produce the energy of stars.
Thermonuclear reactions are fusion reactions, in which light nuclei such as hydrogen isotopes join to form heavier ones. They need temperatures of millions of kelvin so that the nuclei move fast enough to overcome their electrical repulsion. Such conditions exist in the cores of stars, including the Sun, where hydrogen is fused into helium.
Nuclear reactors and atom bombs release energy by fission, the splitting of heavy nuclei such as 235U and 239Pu. Volcanoes are driven by the Earth's internal heat, much of which comes from radioactive decay, not fusion.
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