Ms Jefferson Promises Her Students Special Treats If They Turn

Ms. Jefferson promises her students special treats if they turn in their homework assignments the next day. But on the following day Ms. Jefferson forgets to bring the treats she promised. Given what psychologists have learned about what happens when consequences of learners' behaviors are inconsistent with learners' expectations,what has just happened to the students who turned in their homework assignments?

A) They have been negatively reinforced for doing so.
B) They have been punished for doing so.
C) They have been vicariously reinforced for doing so.
D) Their behavior has been extinguished.