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 differentiate between stress-based physiological arousal and lying.
B) measures the potential for a person to lie but isn't able to determine what they are lying about.
C) is accurate only for people who feel remorse for what they have done.
D) can be beaten with some guided practice.