Which of the following describes the most common type of fire extinguisher?

The most common type of fire extinguisher is the ABC extinguisher because it is versatile and effective on multiple classes of fires. The ABC extinguisher uses a dry chemical agent that can extinguish ordinary combustibles (Class A), flammable liquids (Class B), and electrical fires (Class C). This broad application makes it suitable for a wide range of environments, including homes, workplaces, and public spaces. Its ability to handle various types of fires means it is widely accepted and recommended for general use, which is why it is considered the most common type.

In contrast, other extinguisher types are more specialized: Class D extinguishers are designed specifically for combustible metals, which are not commonly encountered in everyday situations. Class C extinguishers are effective against electrical fires but are limited to that specific class. Class K extinguishers are targeted towards kitchen fires that involve cooking oils and fats, making them less common than the versatile ABC type.