How is heat generated by braking dissipated?

Answer: C — Through metal brake drums

Braking energy is transferred into heat energy, which is then dissipated through various cooling systems. Air circulation, or the flow of air over the brake components, can help to cool the brakes but is not the primary method of dissipation. Brake pads create friction to slow down the vehicle, but they do not directly dissipate heat. Coolant fluids help to regulate the temperature of the engine and other components, but they are not directly involved in dissipating brake heat. Metal brake drums are specifically designed to absorb and dissipate heat generated during braking, making them the correct option.