Which system is checked for leaks to prevent environmental hazards during an inspection?

The correct choice highlights the importance of checking the oil and fuel systems during a vehicle inspection to prevent environmental hazards. These systems can be critical sources of leaks that, if not addressed, can lead to harmful substances entering the environment. Oil leaks can contaminate soil and water sources, while fuel system leaks pose risks of fire hazards and can also pollute the ground and waterways.

By focusing on the oil and fuel systems, inspectors aim to identify any signs of leakage, which could indicate a malfunction or deteriorating components. This proactive measure helps ensure that vehicles operate safely and reduces the potential for environmental damage, aligning with regulatory compliance aimed at protecting the environment.

In contrast, while the brake system, cooling system, and electrical system are vital to vehicle safety and operation, they do not represent the same level of direct environmental risk due to leaks as the oil and fuel systems do. Thus, tracking the integrity of oil and fuel systems during inspections plays a critical role in promoting both vehicle safety and environmental protection.