An antitheft device involving an electronic homing beacon has been

An antitheft device involving an electronic homing beacon has been developed for use in tracking stolen automobiles. Although its presence is undetectable to a car thief and so does not directly deter theft, its use greatly increases the odds of apprehending even the most experienced car thieves. The device is not yet used by a large percentage of car owners, but in cities where only a small percentage of car owners have the device installed, auto thefts have dropped dramatically.

Which one of the following, if true, would most help to explain the dramatic impact of the antitheft device?

(A) Car thieves will tend to be less cautious if they are unaware that a car they have stolen contains a homing beacon.
(B) Typically, the number of cars stolen in cities where the homing beacons are in use was below average before the device was used.
(C) Before the invention of the homing beacon, automobile thieves who stole cars containing antitheft devices were rarely apprehended.
(D) A large proportion of stolen cars are stolen from people who do not live in the cities where they are stolen.
(E) In most cities the majority of car thefts are committed by a few very experienced car thieves.­