8. By analyzing the garbage of a large number of average-sized
households, a group of modern urban anthropologists has found that
a household discards less food the more standardized—made up of
canned and prepackaged foods—its diet is. The more standardized a
household’s diet is, however, the greater the quantities of fresh
produce the household throws away.
Which of the following can be properly inferred from the passage?
(A) An increasing number of households rely on a highly
standardized diet.
(B) The less standardized a household’s diet is, the more nonfood
waste the household discards.
(C) The less standardized a household’s diet is, the smaller is
the proportion of fresh produce in the household’s food waste.
(D) The less standardized a household’s diet is, the more canned
and prepackaged foods the household discards as waste.（C）
(E) The more fresh produce a household buys, the more fresh produce
it throws away.
不明白为什么是C呀。C明明是已知的否命题怎么能对呢？
谢谢大家帮忙！ | 
