What is the primary function of a vehicle's frame?

The primary function of a vehicle's frame is to support the weight of the vehicle and its components. The frame acts as the structural backbone of the vehicle, providing stability and strength. It is designed to bear the load of various parts, including the engine, transmission, suspension system, and the body of the vehicle itself. A well-designed frame ensures that all of these components work together effectively, maintaining the vehicle's integrity and safety.

While aesthetic appeal and fuel efficiency may be notable aspects of vehicle design, they do not describe the fundamental role of the frame. Fuel efficiency is influenced by the design and technology of the engine and other systems rather than the frame itself. Similarly, protecting the engine from damage is accomplished through various components like engine mounts and protective shields, rather than the primary role of the frame. Ultimately, the frame's main purpose is to provide robust support, making option C the correct choice.