TOEFL Reading: ETS-TOEFL阅读机经 - 0ZK5W49936DR322HL$

Why does the author provide the information that "Heavy elements are continually being manufactured by stars and released into space by stellar deaths" A. To explain how it is that the elements required for life can be found everywhere B. To provide evidence that our solar system is relatively young C. To argue that some solar systems are more likely to support life than others D. To explain why heavy elements have greater mass than hydrogen and helium