Many environmentalists rank global warming

1. Many environmentalists rank global warming as the most serious current threat to the world's environment, citing evidence that over the past 30 years, the global temperature has risen an average of 2 degrees. However, the average global temperature this year is equal to the average global temperature of last year. Global warming, therefore, is not as serious a problem as these environmentalists claim.

The argument is most vulnerable to the criticism that it:

(A) Argues that because a threat is present, that threat must be more serious than any other possible threat.

(B) Concludes that because there is lack of evidence for a problem, that problem does not exist.

(C) Attempts to refute a conclusion about a general trend by appealing to a single counterexample, even though such a counterexample may be consistent with the general trend.

(D) Relies on the ambiguous use of a key term.

(E) Presupposes what is seeks to establish.

LSAT