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

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

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

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

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

(D) The total weightof glass bottles purchased by households increased at a slightly faster ratethan 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.

答案是C，为什么不是A。

提问：为什么不是A。A虽然不能完全得出结论，但在一定程度上support结论。most help和support有什么区别？

C不是无关吗？