What Is the Biggest Problem with Using Lie Detector Tests

Multiple Choice

What is the biggest problem with using lie detector tests?

A) The general public doesn't understand the technology involved well enough to interpret the data properly.
B) They can't be properly tested, because the liar is always instructed to lie and this may cause a different physiological reaction than lying for real.
C) They don't detect lies, they detect emotional reactions to stimuli.
D) There is low reliability with lies and low validity with truths.