According to the last paragraph, a psychologist is like ______.

A．the problem of different opinions
B．the argument among three people
C．why different people perceive totally different things about the same scene
D．how to solve the problems of the people when they have different opinions

A．a policeman was giving a cyclist a ticket
B．there was a traffic jam at the intersection
C．a woman was trying to cross the street with four children
D．their perceptions of what they see are different