Which of the Following Best Exemplifies Automatic Influence

Which of the following best exemplifies automatic influence?

A) People are more likely to purchase a product if they have been given a free sample.
B) In trying to guess how much a point of light moves in a dark room, people use the estimates of others as an anchor.
C) Beginning shortly after birth, infants often mimic simple gestures such as sticking out the tongue or moving the head .
D) Adolescents often go along with the behavior of popular others to avoid social rejection.