求救:大全A-15

我也不知道c是什么意思？ 请牛人务必指教啊，希望给解释一下迷津

比较疑惑的一道题，清楚的请指点一下啊

15.   Alba: I don’t intend to vote for Senator Frank in the next election. She is not a strong supporter of the war against crime.

Tam: But Senator Frank sponsored the latest anticrime law passed by the Senate.

Alba: If Senator Frank sponsored it, it can’t be a very strong anticrime law.

Which of the following identifies the most serious logical flaw in Alba’s reasoning?

(A) The facts she presents do not support her conclusion that Senator Frank is soft on crime.

(B) She assumes without proof that crime is the most important issue in the upcoming election.

(C) She argues in a circle, using an unsupported assertion to dismiss conflicting evidence.

(D) She attacks Senator Frank on personal grounds rather than on he merit as a political leader

(E) In deciding not to vote for Senator Frank, she fails to consider issues other than crime.

原题如上,  答案是C  清楚地给解释啊