The correct answer is C. By showing that most students are not tardy because of doctor's appointments.
Explanation
A counterclaim is an argument that contradicts or opponents the main claim of an argument. In this case, the counterclaim is "Some residents believe that this is due to early morning doctor appointments" because these sentences oppose the idea of the author about making schools have starting time every day. Additionally, the author responds to the counterclaim by saying "Only eight percent of those students had medical excuses". So, the correct answer is C. By showing that most students are not tardy because of doctor appointments.
