Bobby Has Trouble Sitting Still in Class, and a Behavior

Multiple Choice

Bobby has trouble sitting still in class, and a behavior consultant works with a teacher to implement a clinical program in which she praises Bobby when staying in his seat. Bobby's sitting behavior increases, and the teacher concludes to the behavior consultant that her praise was responsible for the change. The teacher does not realize that Bobby has started taking medication that causes fatigue. In this example, the medication is serving as:

A) the dependent variable
B) the independent variable
C) an extraneous variable
D) the response class