Which is not an extracurricular activity?

A. Volunteering at a homeless facility

B. Playing high school football

C. Taking an extra year of math

D. Joining the marching band

C. Taking an extra year of math. All the other activities require something to do after school. Volunteering requires you to go to the shelter. Playing football will require you to go to the training sessions that are usually after school. The only option that doesn't really require you doing anything after school is taking the extra year of math, if you don't add in the homework.