题目选项分析

Automobile Dealer's Advertisement：The Highway Traffic Safety Institute reports that the PZ 1000 has the fewest injuries per accident of any car in its class.This shows that the PZ 1000 is one of the safest cars available today.

Which of the following, if true, most seriously weakens the argument in the advertisement?

【选项】Cars in the class to which the PZ 1000 belongs are more likely to be involved in accidents than are other types of cars.