What is the correct method to check the operation of the horn?

Answer: B — Press the horn button and listen for sound

The correct method to check the operation of the horn is to press the horn button and listen for sound. This straightforward approach allows the driver to determine whether the horn is functioning properly at the moment of inspection. By actively engaging with the horn, the driver can assess its audibility, ensuring that it can effectively alert others on the road to potential hazards and enhance overall safety. Inspecting the physical condition of the external horn could be beneficial as a secondary check, but it does not confirm functionality. A sound level meter would provide precise measurements of the horn's loudness, but it is not a practical step during a basic pre-trip inspection. Checking the vehicle’s manual for specifications can offer insight into the horn's required performance, yet it does not verify that the horn is currently operational. Hence, listening for sound is the most direct and effective way to confirm that the horn is working as intended.