Which of the following is an example of conformity?

A) A soldier shoots enemy women and children on orders from his commanding officer.
B) A policeman beats a prisoner to force a confession on orders of his commanding officer.
C) Passengers move to the back of the bus as soon as the driver tells them to.
D) Stan has thrown away all of his old ties and bought new ones to "be in style."

Conformity involves changing one's behavior or beliefs in response to explicit or implicit pressure (real or imagined) from others. In the example of Stan changing his ties to be in style, he is conforming to societal or peer expectations regarding fashion, which is a classic example of conformity. The other options involve obedience to authority or direct orders, which is a different psychological concept.