What component regulates the engine’s air intake?

The throttle body is the component responsible for regulating the engine’s air intake. It controls the amount of air that flows into the engine based on the driver's acceleration input. When the accelerator pedal is pressed, the throttle body opens wider, allowing more air to enter the engine, which is essential for the combustion process. This regulation of airflow is crucial for optimizing engine performance, fuel efficiency, and emissions control.

In contrast, fuel injectors are responsible for delivering fuel into the combustion chamber, but they do not directly control air intake. The crankshaft converts linear motion from the pistons into rotational motion and plays no part in regulating air. The camshaft is responsible for opening and closing the engine's valves at the correct times during the intake and exhaust strokes but does not regulate the volume of air entering the engine directly. Therefore, the throttle body specifically fits the role of controlling air intake, making it the correct component in this context.