Which components should be specifically inspected on the tires?

The correct answer highlights key aspects of tire inspection that are critical for safe vehicle operation. Tread depth is vital for maintaining traction on the road, especially in wet or slippery conditions. Under-inflated tires can lead to increased wear and decreased fuel efficiency, and they also pose significant safety risks. Sidewall condition is crucial because any cuts, bulges, or cracks can lead to tire failure. Regularly checking these three components ensures that the tires are in good condition, which is essential for driving safety and overall vehicle performance.

The other options mention components that, while important for vehicle operation, do not specifically pertain to tire inspection. Brake fluid levels, battery conditions, spark plugs, suspension parts, body panels, engine mounts, and transmission fluid are all relevant to different systems of the vehicle, but do not address the specific requirements for tire safety and maintenance. Understanding the importance of these tire components allows for better preparedness during a pre-trip inspection, ensuring safe travels.