Final answer:
In a situation with a 16-year-old male with arterial bleeding from his leg, controlling the bleeding is the top priority, followed by additional medical care.
Step-by-step explanation:
When approaching a 16-year-old male with bright red spurting blood coming from his leg, the immediate action should be C. control the bleeding. This is a clear sign of arterial bleeding, which can be life-threatening due to the possibility of rapid blood loss. Prioritizing hemorrhage control is crucial before addressing other concerns like oxygen administration or airway assessment. After controlling the bleeding, other steps such as calming the patient down and further medical assessment can follow.