Final answer:
Technician B is correct because tire belts help strengthen the plies and stiffen the tread, rather than forming the body of the tire as Technician A suggests.
Step-by-step explanation:
Regarding the question about automotive tires, Technician B is correct. The belts within an automotive tire are used to strengthen the plies and stiffen the treads. The body of the tire, also known as the carcass, consists of multiple layers of fabric, usually made from polyester, rayon, or other materials. The belts are layers of fabric and steel wire located between the tread and the plies that add strength and stability to the tire. Therefore, the correct answer is: (b) B only.