Antonyms are the opposite words. Consumer reports noted only a fractional change in the cost of groceries in this the antonym of fractional could be significant.
The meaning of fractional is a tiny or small amount of anything. On the other hand, significant means sufficiently or noticeably in the large amounts.
In the sentence, consumer reports noted only a fractional change in the cost of groceries, the antonym for fractional could be significant.
Thus, the correct option is C.
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