The option that has words that are antonyms to "voluminous" is the following:
C. Cramped, claustrophobic; insufficient.
An antonym is a word that has the opposite meaning of another word. For example, the word "big" is the antonym of the word "small".
"Voluminous" is an adjective used to refer to something that is ample and spacious, or to something that takes up a lot of space.
Thus, we can think, for example, of a voluminous hall or of voluminous writing.
Therefore, the words "cramped" and "insufficient" are the opposite of voluminous. They refer to something that is small and to something that does not occupy all the space, respectively.
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