Which of the Following Is an Example of an Adaptor

Which of the following is an example of an adaptor?

A) A businesswoman breaks off eye contact with a visiting friend to signal the end of the meeting.
B) To his teenager tying up the family phone, a father makes a "time-is-up" motion with his hand.
C) While explaining how to get to the post office, a woman points in the correct direction.
D) When speaking before the boss, an employee nervously rubs his nose. (pp. 143-144)