A student hits you in the back of your head with a tennis ball. You do not know who has thrown the ball, and you are quite angry. What should be your next step?
A. Stop the bus until you calm down.
B. Pull off the side of the road and tell the students you will not move until the person who threw the ball comes forward.
C. Continue driving until you calm down or until you reach the school; then try to find the guilty one.
D. Immediately find the guilty one and write a disciplinary referral.