What role do coil springs play in suspension systems?

Coil springs play a critical role in suspension systems by supporting the vehicle’s weight and absorbing road shocks. They are designed to compress and expand as the vehicle moves over uneven surfaces, which helps to maintain ride comfort and vehicle stability. When the vehicle encounters bumps or potholes, the coil springs compress to absorb the impact, reducing the amount of force that is transmitted to the vehicle’s frame and occupants. This absorption is essential for keeping the tires in contact with the road, which contributes to better handling and overall safety.

The primary function of coil springs in this context is to maintain suspension height and provide a compliant ride, which aligns perfectly with why option B is the correct response. Other choices relate to vehicle characteristics not directly influenced by the role of coil springs, such as weight reduction, aerodynamic performance, or braking enhancements. These aspects are typically managed by different vehicle components and systems.