Which of the following can result in better control of vehicle emissions?

Regular maintenance of engine components plays a crucial role in achieving better control of vehicle emissions. Maintaining critical elements such as the fuel injectors, spark plugs, and exhaust systems ensures that they operate efficiently and prevents the buildup of harmful deposits. A well-maintained engine runs more efficiently, burns fuel more completely, and reduces the release of unburned hydrocarbons, nitrogen oxides, and particulate matter into the atmosphere.

When engine components are regularly serviced, it helps in identifying and addressing any potential malfunctions or wear and tear before they escalate into more significant issues. This proactive approach contributes to compliance with emission standards and aids in overall vehicle performance.

Other choices may contribute to vehicle health, but they do not directly impact emission control as comprehensively as regular maintenance of engine components does. For example, while periodic oil changes can help ensure proper lubrication and engine function, they are just one aspect of maintaining the engine. Using non-synthetic motor oil has minimal relevance concerning emissions control compared to proper maintenance. Neglecting fuel system cleaning can actually lead to increased emissions rather than improving them, making it counterproductive in the context of emission control.