Kevin Was Not Enrolled in School, nor Did He Have

Multiple Choice

Kevin was not enrolled in school, nor did he have a job that required mathematical skills or reasoning.Despite these facts, he spent several nights a week reading and solving problems in an old calculus textbook.How would you BEST explain this behavior? Kevin is ________.

A) mentally ill
B) externally motivated
C) intrinsically motivated
D) driven by the incentive motive