What types of leaks should be checked during a pre-trip inspection?

Answer: D — Oil and fluids

During a pre-trip inspection, it’s essential to check for any leaks that could affect the vehicle's performance and safety. The correct answer highlights the need to monitor both oil and miscellaneous fluids which may include coolant, brake fluid, washer fluid, and power steering fluid, among others. These fluids are critical for the proper operation of various systems within the truck. Oil leaks can indicate a problem with the engine lubrication system and may lead to serious engine damage if not addressed. Checking for coolant leaks is equally crucial, as coolant is necessary for regulating engine temperature. When fluids leak, they can create hazards on the road and increase the potential for mechanical failures. While the other options mention specific types of liquids, the emphasis on "oil and fluids" in the correct choice captures a broader scope necessary for a comprehensive pre-trip inspection. Fluids encompass various important substances that, if leaking, can indicate various issues that need immediate attention for safe operation of the vehicle.