The detachable part of the unibody that supports the engine and transmission.

• A. Crossmember
• B. Engine Mount
• C. Floorpan
• D. Subframe

Answer: (D)

In a unibody design, the part that serves as a detachable platform for the engine and transmission is the subframe. It’s a separate, rigid assembly that bolts to the main body and provides mounting points for the engine, transmission, and often the front suspension. Because it can be removed as a unit, it makes engine/transmission service or replacement easier without disassembling the entire vehicle structure. The crossmember, while it may be part of the subframe or support front suspensions, is a structural element rather than the detachable powertrain-supporting assembly. The floorpan is the bottom shell of the passenger area and doesn’t directly support the drivetrain. Engine mounts attach the engine to the subframe or chassis; they’re connection points, not the standalone powertrain-supporting structure.