Answer:
All the other members of the committee vote in favor.
Step-by-step explanation:
In psychology, peer pressure (or social pressure) refers to the influence on people by peers. In other words, the fact that a person changes his/her attitudes, values or behaviors to conform to those of the rest of the group.
In this example, Professor Song disagrees on beginning to accept students with below-average grades. Some other committee members vote in favor.
According to peer pressure, Professor Song will likely vote in favor if he is influenced by the other members of the committee to do so and thus he would change his belief to conform to those of the rest of the group.
This will most likely happen if all the other members of the committee vote in favor. (since otherwise he would be the only one voting against it)