Which of the following are considered the major parts of a vehicle?

The major parts of a vehicle encompass the essential systems and structures that contribute to its operation and overall functionality. The correct choice identifies components that play fundamental roles in how the vehicle operates and drives.

The chassis provides the framework that supports the entire vehicle, meaning it is crucial for structural integrity. The engine is pivotal, as it generates the power necessary for movement. The transmission system is equally significant because it transfers power from the engine to the wheels, allowing the vehicle to move efficiently. The body of the vehicle not only houses all the internal components but also plays a prominent role in safety and aerodynamics. Finally, the steering system is vital for controlling the direction of the vehicle, directly impacting maneuverability.

Each of these parts is integral to the operation and performance of a vehicle, highlighting why they are classified among the major components. The other options mention important vehicle systems but do not encapsulate the core components as effectively as the correct answer does.