Which Scenario Is the BEST Example of the Overjustification Effect

Which scenario is the BEST example of the overjustification effect?

A) Regan used to like painting pictures. However, once she started getting paid for painting, she refused to paint unless she was paid to do so.
B) Warren does not work very hard, so he claims his poor performance because his job is very difficult.
C) Melinda feels that she is overpaid for her work. As a result, she works much harder and for longer hours than she would if she were paid less.
D) Julian spends a great deal of time procrastinating so that he has to rush to finish his work. This way, when his work is poor quality, he can blame it on the rushing rather than on his abilities.