OG上面的一道题

Johnsonjz

ln 1979lack of rain reduced India's rice production to about 41 million tons, nearly 25 percent less than those of the 1978 harvest.


(A) less than those of the 1978 harvest
(B) less than the 1978 harvest
(C) less than 1978
(D) fewer than 1978
(E) fewer than that of India's 1978 harvest




正确答案是B，想问一下A选项中的those是否可以指代前面出现过的tons？如果这样的话，两个年份的tons做比较，为什么不可以选A？

Tranciy

OG上说因为相比较的两个年份都是用tons衡量，所以只需要用年份比较，难道因为对比里有一致的，所以一致的可以省略吗？？