In each of the following sentences, there is one word underlined and one gap. From the list of words lettered A - D, choose the word that is most nearly opposite in meaning to the underlined word and that will, at the same time, correctly fill the gap in the sentences.
The purpose of education is to enhance progress and not to...........it

A. proscribe
B. intercept
C. impede  
D. confuse

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Correct Answer: C