Four People Have Just Observed a Suspect Deny That She

Four people have just observed a suspect deny that she committed a theft.Which observer is most likely to detect whether the suspect is lying?

A) Frank, who is a rookie on the police force
B) Alice, who has just taken a social psychology class.
C) Andy, who has worked for Canadian Customs
D) Bobby, who is visiting the police station as part of a university assignment
E) None of the above observers has an edge in detecting lies.