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What best describes what happens during stellar fusion in a main sequence star.

A one step process where one atom of helium is generated from four atoms of hydrogen.

A complex process from which all the elements of the periodic table are formed.

A three step process from which hydrogen fuses to helium, which fuses to carbon, which fuses to silicon

A three step process where one atom of helium is generated from six atoms of hydrogen, returning two atoms of hydrogen to the stellar core.