Pro-Teet Insurance Company has recently been paying out more on car-theft claims than it expected. Cars with special antitheft devices or alarm systems are much less likely to be stolen than are other cars. Consequently Pro-Teet, as part of an effort to reduce its annual payouts, will offer a discount to holders of car-theft policies if their cars have antitheft devices or alarm systems.
Which of the following, if true, provides the strongest indication that the plan is likely to achieve its goal?
【选项】The decrease in the risk of car theft conferred by having a car alarm is greatest when only a few cars hav.e such alarms.