John Believes That He Is Incompetent and a Failure

John believes that he is incompetent and a failure. When you point out the great grade John has just received in his last essay, John states, "Well, the professor just gives good marks, and it doesn't matter the quality of your work. He probably did not even read my essay." John would be considered to have an:

A) internal power.
B) external power.
C) internal locus of control.
D) external locus of control.