TOEFL Listening: TPO-TOEFL阅读TPO - 8SKXN914B1034174N$

In the passage, why does the author mention that "the increase of the dark-colored forms was not due to genetic mutations caused by industrial pollution"? A. To suggest that the rate of genetic change in peppered moths actually decreased B. To emphasize that pollution in industrial areas had no role in the increase of dark peppered moths C. To introduce the information about the soot-covered trees that caterpillars fed on as the correct explanation for the increase in dark peppered moths D. To reject a view of the role of pollution in the increase of dark peppered moths that would not involve natural selection