Billy has gotten pretty low grades on pretty much all of his quizzes and tests. Now he thinks he's not smart, he can't understand anything, and trying hard to do better isn't even worth his time and effort. As a result, he doesn't spend enough time to work on his homeworks. And he doesn't even read the textbook thoroughly. And when he takes a test, he gets a low grade, which confirms his belief that he is not smart. This is an example of:
A self-fulfilling prophecy
B inferiority complex
C Dyslexia
D Attention deficit