If the clutch does not disengage completely, the primary shaft of the gearbox continues to be driven by the engine, which makes shifting the gears difficult or even prevents it. 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 completely interrupt the connection between the engine and the gearbox, which can lead to major difficulties in operating the vehicle.
The correct answer is: C
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