Answer:
B. sitting with another student instead of sitting by herself
Step-by-step explanation:
When we speak of "operant" behavior we are talking about a relationship between a class of responses, the consequences it produces, and the changes in responding promoted by these consequences. In Judy Ann's case, operant behavior is represented by "sitting with another student instead of sitting by herself" in response to her frustration with the treatment she was receiving from colleagues when she sat alone.