In Which Situation Is It Appropriate to Use a Tourniquet

In which situation is it appropriate to use a tourniquet?

A) You are the only EMT on the scene where one patient has a closed humerus fracture and another needs leg elevation.
B) You are the only EMT on the scene where one patient is bleeding heavily from his arm and another needs airway support.
C) You have a patient who is terrified at the sight of blood and is panicking that he will lose too much blood.
D) You have a patient with a laceration to his wrist, and your medical kit does not have enough dressings and bandages.