One Problem with the Use of the Polygraph to Detect

One problem with the use of the polygraph to detect lying is that the test

A) cannot distinguish between stress-based physiological arousal and lying.
B) measures only how much someone lies, rather than what he or she is lying about.
C) can indicate only whether a person is sweating, not whether he or she shows an increase in heart rate.
D) measures positive emotions in the same way it measures negative ones.