TOEFL Reading: ETS-TOEFL阅读机经 - W26LC_98845VKB88L$

What role does paragraph 4 play in the passage? A. It explains the difficulties in collecting evidence about kinship relationships. B. It introduces a new hypothesis to replace the one presented in paragraph 2. C. It explains the relationship between hypotheses, prediction, and evidence. D. It introduces another observation test of the hypothesis presented in paragraph 2.