Which of the following is a requirement for the airline to the brake chamber?

Answer: C — Not cut, frayed, or rubbing anything

The requirement for the airline to the brake chamber is that it must not be cut, frayed, or rubbing against anything. This is important for ensuring the integrity and proper functioning of the braking system. Any damage to the airline can lead to air leaks, which may result in insufficient air pressure being delivered to the brake chamber, ultimately compromising the vehicle's braking effectiveness. Maintaining the airline in good condition is critical for the overall safety of the vehicle, as a damaged airline could lead to brake failure or reduced braking performance. Therefore, the emphasis on ensuring that the airline is intact helps to guarantee that the air brake system operates as intended.