What condition should the valve stems be in during a pre-trip inspection?

Answer: B — Both inner and outer, with caps and no leaks

During a pre-trip inspection, it is essential that both the inner and outer valve stems are present, equipped with their caps and free from leaks. This is critical for maintaining proper tire pressure and ensuring the safety of the vehicle. Cap presence is essential because it protects the valve stem from dirt and debris, which can lead to leaks or damage over time. Both valve stems being intact means that the tire can hold air properly, contributing to overall vehicle performance and safety. Leaks can compromise tire pressure, potentially leading to blowouts or reduced handling. Having only the outer valve stem or only the inner valve stem would not provide the necessary assurance of tire integrity. Additionally, the presence of leaks would indicate a malfunctioning valve, posing a significant risk while driving. Therefore, the requirement for both inner and outer valve stems, complete with caps and no leaks, is vital for safe and effective vehicle operation.