Which One of These Examples Best Reflects the Role That

Which one of these examples best reflects the role that students' sense of self typically plays in their achievement and school behavior?

A) Melissa thinks of herself as physically fit,so she doesn't think she needs to participate in sports or other physical activities.
B) Linda knows she is a good reader,so she takes an extra reading class as an elective.
C) Nettie doesn't think she is very popular,so she smiles at others and tries to talk to them so they will like her.
D) Kim doesn't want to take any more math classes because she knows she's already good at math.