In the argument given, the two portions in boldface play which of the following roles?

A. The first introduces evidence to support the main conclusion of the argument; the second is the main conclusion stated in the argument.

B. The first introduces evidence to support the main conclusion of the argument; the second presents a position to which the argument is opposed.

C. The first describes a discovery as undermining the position against which the argument as a whole is directed; the second states the main conclusion of the argument.

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