What describes a unibody vehicle?

• A. A vehicle with detachable body and frame
• B. A vehicle where the body and frame are constructed as one unit
• C. A vehicle with a modular frame
• D. A vehicle where the frame is optional

Answer: (B)

In a unibody vehicle, the body and frame are constructed as one unit. The entire structure carries most of the vehicle’s load, including the suspension and drivetrain, so there’s no separate frame that the body sits on. This integration makes the vehicle lighter and typically stiffer, which improves handling and crash performance and simplifies manufacturing.

The other descriptions describe different designs. A detachable body and frame refers to a body-on-frame design, where the body is mounted to a separate frame. A modular frame implies a frame that can be separated or replaced, which isn’t how unibody systems are built. The idea that a frame is optional doesn’t fit how modern passenger vehicles are constructed. Therefore, the description that the body and frame are one unit best matches unibody construction.