Astronomers have compared the relative abundances of different isotopes of neon found in Moon rocks with those found in the solar wind.What conclusion have they drawn?

Question

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Astronomers have found that the relative abundances of neon isotopes in Moon rocks are very similar to those found in the solar wind, which implies that the Sun's temperature has remained relatively constant over time. If the Sun had been much hotter or cooler in the past, the isotopic composition of the Moon rocks would have been different. Therefore, the best choice is D - The Sun has maintained a much more constant temperature than was previously believed.

Astronomers Have Compared the Relative Abundances of Different Isotopes of Neon