TOEFL Reading: ETS-TOEFL阅读机经 - F45V_HKTIZ67YZPDL$

What is the relationship of paragraph 2 in the passage to paragraph 1 A. Paragraph 2 provides additional support for a scientific hypothesis discussed in paragraph 1. B. Paragraph 2 questions the accuracy of a scientific observation discussed in paragraph 1. C. Paragraph 2 provides a possible explanation for a scientific observation discussed in paragraph 1. D. Paragraph 2 identifies some strengths and weaknesses of a scientific hypothesis discussed in paragraph 1.