大全secB-13

13.   No nation can long survive unless its people are united by a common tongue. For proof, we need only consider Canada, which is being torn asunder by conflicts between French-speaking Quebec and the other provinces, which are dominated by English speakers.

Which of the following, if true, most effectively challenges the author’s conclusion?

(A) Conflicts over language have led to violent clashes between the Basque-speaking minority in Spain and the Spanish-speaking majority.

(B) Proposals to declare English the official language of the United States have met with resistance from members of Hispanic and other minority groups.

have contributed to the provincial conflicts in Canada.

(D) The public of India, in existence sine 1948, has a population that speaks hundreds of different, though related, languages.（E）

(E) Switzerland has survived for nearly a thousand years as a home for speakers of three different languages.

明白e为啥对，我想问一下c为啥错，这里不算是他因削弱么？我说conflicts是由经济，政治和语言共同导致的，不就削弱了论据：冲突是由说两种不同的语言导致的么？

赐教！！