The two boldface portions in the argument above are best described by which of the following statements? A. The first is a conclusion reached by researchers; the second is evidence that that conclusion is correct. B. The first is an explanation of why a certain theory is thought to be true; the second is an example of research results that support this theory. C. The first is an example illustrating the truth of a certain theory; the second is a competing theory. D. The first is a premise upon which the researchers base their opinion; the second illustrates that their opinion is correct. E. The first introduces a theory that the researchers have disproved; the second is the basis for the researchers' argument.