argument 是Removing the boxes will reduce the number of prank calls without hampering people’s ability to report a fi re.
(D) 说的是Responding to false alarms signifi cantly reduces the fi re department’s capacity for responding to fi res. 减少恶意电话和减少预警系统能力是不一样的。 而且文章的argument是改变恶意电话这一现象,和capacity for responding to fires无关。