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A particular company makes a system that is installed in the engine block of a car and, if that car is stolen, relays the car’s location to police via satellite. The recovery rate of stolen cars with this device is ninety percent. This system helps everyone because it is impossible for a thief to tell which cars it is installed on. For these reasons, insurance companies try to encourage customers to get this system by offering lower rates to those who have the system. Competing systems include brightly colored steel bars that attach to the steering wheel and loud alarms that go off when the car is tampered with. These systems simply encourage thieves to steal different cars, and when cars with these devices are stolen, the police rarely recovery them.
Which of the following is the most logical conclusion to the author’s premises?
(A) Insurance companies should give the same discount to car owners that have any protective system because their cars are less likely to be stolen.
(B) The police shouldn’t allow car owners to install the loud sirens on their cars because everyone simply ignores the sirens anyway.
(C) Car owners with the system that relays location to the police should prominently advertise the fact on the side window of their cars.
(D) Thieves should simply steal the cars with loud alarms or bright steel bars because those cars probably wouldn’t also have the more effective system installed.
(E) Insurance companies should give less of a discount, or no discount at all, to the siren and steering wheel systems because they aren’t as effective as the relay system.
OFFICIAL EXPLANATION:
E. This critical-reasoning question requires you to draw a conclusion from the premises included in the argument.
Look for an answer choice that addresses all the information in the premises. You can eliminate conclusions that are off topic or incomplete.
Eliminate choices that don’t include all the elements of the argument. Choices (B), (C), and (D) don’t mention the insurance companies that are the subject of one of the premises. This leaves you with Choice (A) and Choice (E), which offer nearly opposite conclusions. The premises indicate that one of the reasons insurance companies like the engine-block system is that thieves don’t know which cars have it installed. Choice (A) concludes that cars with any protective system, including alarms and steering-wheel bars, should get a discount because those cars are less likely to be stolen. This conclusion doesn’t flow logically from the premises, however, because the reasons given for the insurance discounts are a high recovery rate of stolen vehicles and the general deterrent to all car thefts. Neither of these advantages comes from the alarms or steering-wheel bars. Choice (E) addresses all the premises and logically concludes the argument, making it the correct answer.