What is the main purpose of the frame of a school bus?

Answer: C — To support the weight of the body and withstand road stresses

The main purpose of the frame of a school bus is to support the weight of the body and withstand road stresses. The frame is a crucial structural component that provides stability and rigidity to the vehicle. It acts as a foundation that bears the weight of the bus's chassis, body, and all the components attached to it. Additionally, the frame is designed to absorb and distribute the forces that result from road irregularities, acceleration, and braking. This ensures the bus maintains its shape and structural integrity while operating, contributing to overall safety and performance. While aesthetic design may enhance the bus's appearance, it is not the primary function of the frame. Similarly, holding the roof in place and decreasing air resistance are secondary roles that may result from a well-designed frame but are not its primary purpose. The main focus of the frame's design is to provide essential support and stability under various driving conditions.