What are two types of fluid a driver must check during a pre-trip inspection?

During a pre-trip inspection, it is crucial for a driver to check both engine oil and coolant for several important reasons. The engine oil ensures that the engine is properly lubricated, which is essential for preventing excessive wear and tear on engine components and for maintaining optimal performance. Low engine oil can lead to engine overheating or failure.

Coolant, on the other hand, is vital for regulating the engine’s temperature. Proper coolant levels help prevent the engine from overheating, which can result in significant damage. Ensuring both the engine oil and coolant are at appropriate levels is a fundamental part of vehicle maintenance and directly contributes to the safety and reliability of the vehicle during operation.

While the other options include important fluids, they do not encompass the critical combination of engine oil and coolant that directly impacts overall engine health and performance in a more primary sense. Thus, option B is the most comprehensive and relevant choice for this question.