Final answer:
The correct answer is option A: asbestos.The concern when changing a clutch disc is the presence of asbestos, which is a hazardous material that can cause health problems if inhaled.
Step-by-step explanation:
When changing a clutch disc, one of the concerns is the presence of asbestos. Asbestos was commonly used in older clutch discs due to its heat resistance and durability. However, asbestos is a hazardous material that can cause serious health problems if inhaled.
During the clutch replacement process, it is important to take precautions to ensure that asbestos fibers are not released into the air. This includes wearing proper personal protective equipment, such as a respirator and gloves, and working in a well-ventilated area.
Asbestos has been phased out in many industries, including automotive, due to its health risks. Modern clutch discs are typically made with non-asbestos materials.