At Food World Supermarket, built in 1975, the number of

At Food World Supermarket, built in 1975, the number of successful thefts has risen
dramatically in the last few months. Food World has a reliable electronic security system at all
customer exit doors, and this system is always in operation. Therefore, the thefts must have
been committed by people who used exits other than the regular customer exit doors.

Which of the following is an assumption that would make the conclusion above logically correct?

A. If a surveillance system is installed in a supermarket, it is always equipped at every
possible exit.
B. If an employee so wishes, he is allowed to leave through an exit that is not monitored by
surveillance equipment.
C. If a store has a reliable security system, it is impossible to pass through the system
undetected.
D. If a supermarket was built before 1980, it often has exits that cannot be equipped with
electronic surveillance.
E. If a store has a reliable electronic security system but is still experiencing a rise in theft, it
must be the case that the employees are stealing.