GMAT Critical Reasoning (CR) | Automobile Dealers Advertisement: The Highway Traffic

Automobile Dealer's Advertisement:

The Highway Traffic Safety Institute reports that the PZ 1000 has the fewest injuries per accident of anycar in
its class. This showsthat 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?

(A) The HighwayTraffic Safety Institute report listed many cars in other classes that had more injuries per accident than did the PZ 1000.
(B) In recent years many more PZ