Radar detectors are devices that sense the nearby use of a radar gun, and, in doing so, alert drivers to the presence of police officers who might catch drivers for speeding. But evidence shows that drivers who have radar detectors in their cars are actually 10% more likely to receive speeding tickets than those who do not have radar detectors. Drivers should therefore save the money they would spend on radar detectors and simply pay the tickets they’re going to receive whether they use a radar detector or not.

Which of the following, if true, would cast the most doubt on the argument above?

Correct answer marked below

Several highway patrol agencies have begun developing strategies to target drivers who use radar detectors.

Only the drivers most likely to receive speeding tickets purchase and use radar detectors.

Correct

Radar detectors only cost a fraction of the expense that drivers spend on the purchase and maintenance of their vehicles.

Radar detectors do not help drivers avoid other types of tickets, such as those for failure to fully stop at a stop light.

Mobile phone companies have recently developed apps that will alert drivers to the presence of police officers along their route.

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What this question tests

Whether you can identify the option that most undermines an argument's conclusion.

Choosing an irrelevant objection or one that attacks the premise rather than the reasoning.