TOEFL Reading: ETS-TOEFL阅读机经 - E3B6_56NZ1C3S335L$

In paragraph 1, why does the author state that Earth has less nitrogen, argon, hydrogen, and helium that the Sun? A. To argue that these elements were once part of an early atmosphere, which disappeared B. To suggest that these elements were drawn into the Sun's atmosphere C. To provide evidence that Earth's original atmosphere came primarily from meteorites D. To support the claim that Earth's atmosphere would have changed even more if it had contained more volatile elements