Question ID:PT48 S1 Q1 Passage:The effort involved in lying produces measurable physiological reactions such as a speedup of the heartbeat.  Since lying is accompanied by physiological reactions, lie-detector tests that can detect these reactions are a sure way of determining when someone is lying. Stem:Which one of the following statements, if true, most seriously weakens the argument? Correct Answer Choice:DChoice A:Lie-detector tests can measure only some of the physiological reactions that occur when someone is lying. Choice B:People are often unaware that they are having physiological reactions of the sort measured by lie-detector tests. Choice C:Lying about past criminal behavior does not necessarily produce stronger physiological reactions than does lying about other things. Choice D:For people who are not lying, the tension of taking a lie-detector test can produce physiological reactions identical to the ones that accompany the act of lying. Choice E:When employers use lie-detector tests as part of their preemployment screening, some candidates tested are highly motivated to lie.