Hydrogen is the fuel for the nuclear fusion reaction that occurs in the Sun, therefore the correct answer is option D.
What is nuclear fusion?
A reaction known as nuclear fusion occurs when two or more atomic nuclei combine to create new atomic and subatomic particles. Energy is released or absorbed depending on how much mass there is between the reactants and products.
The fusion of hydrogen to form helium is the main source of energy for the sun and other stars of a similar size.
The nuclear force, which brings protons and neutrons together, and the Coulomb force, which makes protons repel one another, interact to produce the energy release associated with the fusion of light elements. Despite being positively charged and repel one another due to the Coulomb force, protons can still stick together, proving the existence of a different, more localized force known as nuclear attraction.
Thus, The correct answer is option D because hydrogen serves as the fuel for the nuclear fusion reaction that takes place in the sun.
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