Quick multiple-choice question: Why is it important for airport security to check carry-on luggage for bombs?

A. The bomb's batteries could leak and damage other passenger bags.
B. The wires in the bomb could cause a short to the aircraft wires.
C. Bombs can cause loss of lives, property and aircraft.
D. The ticking timer could worry other passengers.

For more challenging questions like this, check out today's Times article on the written test given to airport trainees.

(P.S. The answer is "C.")