Answer: B. Suggestibility
Explanation: According to the statement in the question, Alex saw a girl in a red shirt stealing a candy bar. When asked by police what candy bar was stolen by the girl in the blue shirt, Alex accepts that it is a girl in a blue shirt. It is the result of suggestibility, and that is the tendency to accept according to the suggestions of others. In general, the information Alex gave is credible because it is a girl who stole a candy bar, but some part of the information is false, that part of the information that appears as a gap in memory for various reasons. These gaps in memory can occur as a result of the excitement or authority of a police uniform, and are usually filled with false information as a product of suggestibility.