The Main Advantage of the Guilty-Knowledge Test Over the Usual

The main advantage of the guilty-knowledge test over the usual lie-detector test is that the guilty-knowledge test

A) will succeed even with people who have learned to suppress their physiological responses.
B) requires little or no advance preparation by investigators.
C) is very unlikely to indicate that an innocent person is guilty.
D) does not rely on physiological changes such as heart rate.