Answer: the answer is A. Bursting of clutch friction is often caused by coasting a truck with the clutch pedal depressed. Coasting most frequently occurs when keeping the clutch depressed while turning at intersections, dressing the pedal too soon before coming to a stop at a stop sign or traffic lights, or keeping the pedal depressed too long after a gear change.
Explanation: A clutch is a mechanical device which engages and disengages power transmission especially from driving shaft to driven shaft. Broken clutch plate facings are caused by incorrect driving practice or incorrect installation procedure.