Why does the passage provide the information that "The drill holes in the Pacific atolls passed through more than a thousand meters of coral before reaching the rock substratum of the ocean floor"? A. To emphasize that according to Darwin's view coral can grow at great depths B. To indicate how scientists knew the rate at which Earth's crust had subsided C. To support the claim that coral reefs take millions of years to form D. To present the evidence that confirmed Darwin's account of coral reef evolution