What is a unibody vehicle?

• A. A vehicle where the body and frame are constructed as one unit
• B. A vehicle with a separate body and frame
• C. A vehicle with a detachable subframe
• D. A vehicle built entirely as a modular system

Answer: (A)

Unibody design means the vehicle’s body and its frame are built as a single integrated structure. The shell itself carries most of the load and provides the crash energy paths, rather than having a separate frame carrying the load. Modern cars mostly use this approach because it saves weight and improves rigidity and safety.

The description that the body and frame are constructed as one unit matches this idea exactly. The other options describe different setups: a separate body and frame is a body-on-frame design; a detachable subframe is a component arrangement within a unibody car but doesn’t define the overall structure; a modular system isn’t the standard definition of unibody.