If the clutch does not disengage completely, the primary shaft of the gearbox continues to be driven by the engine, which makes changing the gear steps difficult or even impossible. In this case, the gears cannot synchronize correctly, and when attempting to change gears loud gear noises appear. These sounds indicate that the clutch does not interrupt completely the connection between the engine and the gearbox, which can lead to major difficulties in the operation of the vehicle.
The correct answer is: C
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