When Joel Met His New Teacher, He Said, "I Struggle

When Joel met his new teacher, he said, "I struggle with everything." When she asked, "What about at school? Is there a subject you like or you are good in?" Joel replied, "No, I'm always behind." Joel's overall self-assessment reflects his:

A) self-control.
B) self-esteem.
C) self-regulation.
D) self-concept.