[求助]请问一道PREP上关于account for 的问题

From 1978 to 1988, beverage containers accounted for a steadily decreasing percentage of the total weight of household garbage in the United States.  The increasingly widespread practice of recycling aluminum and glass was responsible for most of this decline.  However, although aluminum recycling was more widely practiced in this period than glass recycling, it was found that the weight of glass bottles in household garbage declined by a greater percentage than the weight of aluminum cans.

Which of the following, if true of the United States in the period 1978 to 1988, most helps to account for the finding?

(A) Glass bottles are significantly heavier than aluminum cans of comparable size.

(B) Recycled aluminum cans were almost all beverage containers, but a significant fraction of the recycled glass bottles had contained products other than beverages.

(C) Manufacturers replaced many glass bottles, but few aluminum cans, with plastic containers.

(D) The total weight of glass bottles purchased by households increased at a slightly faster rate than the total weight of aluminum cans.

(E) In many areas, glass bottles had to be sorted by color of the glass before being recycled, whereas aluminum cans required no sorting.

正确答案是C。 请各位帮我解释一下A为什么不对？谢谢~

题中说的是比率 也就是 （N-n）/N 等于这个percentage 与重量无关

A说的是数字 偷换了比率 所以错了

C正好是比率变化

题目问人们既然改用塑料和玻璃的环保容器，为什么玻璃的容器和瓶罐还是一样的减少？

C正好解释了厂商大多用环保塑料而不是用玻璃来替代了瓶罐，所以人们玻璃容器的用量也当然减少了