Professor song is a member of the faculty admissions committee. other committee members vote to begin accepting students with below-average grades. professor song personally disagrees, but he will be more likely to vote in favor of their plan if

All the other members of the committee vote in favor.

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)

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."