During the Course of an Interview, the Investigator Asks the Subject

During the course of an interview, the investigator asks the subject who is responsible for the crime being investigated if he or she committed the crime. The subject states that he or she does not know who might have committed the crime, while at the same time he or she nods his or her head up and down. This combination of words and body movement is indicative of deception and an example of the lack of: _____.

A) comfort
B) emphasis
C) synchrony
D) perception management