Keon, one of your students, seems confused when you are giving directions or explanations (he frowns and looks puzzled) but seems much more certain when you write the information on the chalkboard. He is also quite reluctant to participate in question-and-answer activities in class, although his reading and writing are at least average. Based on this information, which of the following is the best explanation for Keon's behavior?
A) He is mildly intellectually handicapped.
B) He is hearing impaired.
C) He has a learning disability.
D) He has ADHD.