In the sixth sentence of the third paragraph (“the near-global diffusion.opposite effect”), the author mentions the diffusion of english primarily to
(A) challenge an assumption that other arguments depend on
(B) offer evidence in support of his basic thesis
(C) emphasize how one phenomenon can have multiple effects
(D) justify his use of one language rather than another
(E) acknowledge the validity of one element of an argument he generally opposes
The correct answer is (C) emphasize how one phenomenon can have multiple effects.
In the mentioned sentence, the author discusses how the diffusion of the English language has had multiple effects, including both positive and negative impacts on communication and linguistic diversity. Therefore, the author mentions the diffusion of English to emphasize how one phenomenon can have multiple effects, rather than to support their basic thesis, challenge an assumption, justify their language use, or acknowledge the validity of an opposing argument.