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.
We nearly lost the trend of his argument because of its complexity but the..............of his language was our saving grace

A. simplicity  
B. correctness
C. openness
D. naivety

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Correct Answer: A