Dry powder fire extinguishers which contain a mixture of graphite and sodium chloride as firefighting agents are generally used to fight which type of fire?

Answer & Explanation

The correct answer is Option D: Class D metal fire.

Dry powder extinguishers containing graphite and sodium chloride are specifically designed for Class D fires, which involve combustible metals. These agents form a crust, smothering the fire and preventing re-ignition.