Final answer:
Releasing the clutch lever gradually a. allows the engine to engage with the transmission smoothly, preventing any sudden jolts or stalling.
Step-by-step explanation:
When starting a car engine, it is important not to release the clutch lever immediately a. because it can cause the engine to stall.
Releasing the clutch lever gradually allows the engine to engage with the transmission smoothly, preventing any sudden jolts or stalling. This is especially important when the engine is cold, as it needs time to warm up and reach its optimal operating temperature.