Final answer:
Downshifting early can allow the engine to rev at a low level, potentially causing the vehicle to stall. It is important to downshift at the right time to ensure a smooth transition and prevent vehicle lurching or stalling.
Step-by-step explanation:
Downshifting too early can risk engine damage due to over-revving, but it typically does not make it impossible to get into a lower gear, cause the clutch to burn out, or force the clutch to pop out. The correct answer to this question is C: Downshifting early may allow the engine to rev at a low level, possibly causing the vehicle to stall. When downshifting, the goal is to match the engine speed with the vehicle speed for a smooth transition. Shifting down too early can lead to a large difference in speed between the engine and the wheels, which can lurch the vehicle and potentially lead to stalling.