What must be done with the vehicle prior to conducting a pre-trip inspection?

Answer: B — The vehicle should be parked safely and turned off

Prior to conducting a pre-trip inspection, it is essential for the vehicle to be parked safely and turned off. This ensures the safety of the person performing the inspection, as it minimizes the risk of accidental movement, which could lead to injury. A stationary vehicle also allows the inspector to thoroughly check all required components such as lights, brakes, tires, and fluid levels without distraction or danger from moving parts. Additionally, having the engine off allows the inspector to listen for unusual sounds and observe any leaks or issues without the noise and vibrations that come from a running engine. This step is a crucial part of preparing for safe driving, as it allows the driver to identify any potential problems before hitting the road. Cleaning the vehicle, inspecting it while in motion, or keeping the engine running do not facilitate a thorough and safe inspection process. Each of these alternatives would compromise safety and effectiveness when assessing the vehicle's condition prior to departure.