Robert Becomes Anxious During Exams

Multiple Choice

Robert becomes anxious during exams.He has found that chewing on the eraser on his pencil while he thinks helps him to calm down.According to Hull,over time Robert's pencil chewing is likely to become _____ due to _____.

A) more effective; positive reinforcement
B) less effective; extinction
C) permanent; positive reinforcement
D) habitual; negative reinforcement