In 1979 lack of rain reduced India's rice production to about 41 million tons, nearly 25 percent less than those of the 1978 harvest.
less than those of the 1978 harvest
less than the 1978 harvest
less than 1978
fewer than 1978
fewer than that of India's 1978 harvest
In B, we are correctly comparing the production in 1979 to the harvest in 1978. If we go with gmatfighter12's proposed phrasing, "less than that of," we have to ask what "that" stands for.
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