Solve

A teacher is implementing a new classroom intervention. She puts a green card on the wall to let students know that she is available for questions and a red card on the wall when her attention Is not available. If a student approaches the teacher while the red card is on the wall, the teacher will say, "I'm not available right now. Please wait for the green card and sit back down." Over time, students stop raising their hands or approaching the teacher's desk when the red card is on the wall, and only seek teacher attention when the green card is up. What is the principle behind the success of this intervention? A. The presence of the red card on the wall signals the availability of punishment for students' behavior of going to the teacher's desk or raising their hands. B. Differential reinforcement resulting in the green card functioning as an SD and the red card functioning as an S-delta. O C. The establishing operation for seeking the teacher's attention has been decreased by the presence of the green card on the wall. O D. The presence of the red card creates an abolishing operation that decreases the value of the teacher's attention when present