Sal Felt Little Motivation to Study and Was Getting Poor

Multiple Choice

Sal felt little motivation to study and was getting poor grades.Her friends tried to convince her to take school more seriously.Sal listened and decided to try harder.She studied more and earned a B+ on her Algebra exam.She was so pleased by the results of her efforts that she now studies all the time.What role did the B+ play in her present motivation?

A) The B+ was a negative reinforcer.
B) The B+ was a positive reinforcer.
C) The B+ had little to do with her motivation;her friends were the reinforcers.
D) The B+ became a conditioned stimulus.