In the unibody structure, what provides the critical mounting positions for the suspension and steering systems?

• A. Front subframe
• B. Steering rack
• C. Upper and lower control arms
• D. Knuckles and spindles

Answer: (C)

In a unibody design, the wheel and its suspension must be held in precise positions by components that anchor to the body and control how the wheel moves. The upper and lower control arms are the main anchors that connect the wheel knuckle to the vehicle body, forming the essential mounting points for the suspension and steering. They establish the wheel’s location in three dimensions, provide the pivots for up-down movement, and control camber and toe as the suspension travels. The steering rack and knuckles attach through these arms to transfer steering input while maintaining correct geometry, but the critical mounting points themselves come from the upper and lower control arms. The subframe can host these components, but the defined mounting geometry that sets the suspension and steering position comes from the control arms.