一道逻辑题请大家帮忙想想

  last year all refuse collected by Shelbyville city services was incinerated. This incineration generated a large quantity of residue ash. In order to reduce the amount of residue ash Shelbyville generates this year to half of last year's total, the city has revamped its collection program. This year city services will seperate for recycling enough refuse to reduce the number of truckloads of refuse  to be incinerated to half of last year's number.

  Which of the following is required for the revamped collection program to achieve its aim?

(D) The refuse incineration this year will generate no more residue ash per truckload incinerated than did the refuse incinerated last year.

请问原题说的是减少truckload的数量，而这个选项说的是减少每个truckload产生的residue ash，这个选项看上去不符原文阿，为什么是正确答案呢。。。

是这个阿

不但truckload数量减少，你还要保证现在一个truckload烧出来的灰不比去年多，才能保证总的灰一定少于去年