18.
A proposed ordinance requires the installation in new homes of
sprinklers automatically triggered by the presence of a fire.
However, a home builder argued that because more than ninety
percent of residential fires are extinguished by a household
member, residential sprinklers would only marginally decrease
property damage caused by residential fires.
Which of the following, if true, would most seriously weaken the
home builder’s argument?
A. most individuals have no formal training in how to extinguish
fires.
B. Since new homes are only a tiny percentage of available housing
in the city, the new ordinance would be extremely narrow in scope.
C. The installation of smoke detectors in new residences costs
significantly less than the installation of sprinklers.
D. In the city where the ordinance was proposed, the average time
required by the fire department to respond to a fire was less than
the national average.
E. The largest proportion of property damage that results from
residential fires is caused by fires that start when no household
member is present.
开始以为however之后的是结论部分，但是仔细看看觉得however之前是结论
。大家觉得呢？ | 
