A Teen and His Friends Are Drinking Beer and Swimming

A teen and his friends are drinking beer and swimming in a river near their neighborhood. The teen climbs a tree and dives headfirst into the river. After a few seconds, his friends realize something is wrong. They pull him onto the riverbank. He is conscious and breathing but unable to move. What should they do first?

A) Immobilize the boy, and call for help.
B) Turn him onto his stomach to allow water to drain from his lungs.
C) Push on his stomach to rid his lungs of water.
D) Use a four-man carry to take the boy to safety.