What part of the car is the bumper mounted to?

The bumper is primarily mounted to the chassis of the car. The chassis serves as the fundamental structure that supports the vehicle’s components, including the frame and the attachment points for various parts. By being mounted to the chassis, the bumper can absorb and distribute energy effectively in the event of a collision, thereby helping to protect both the vehicle and its occupants.

The chassis provides the necessary strength and stability for the bumper, ensuring it remains securely attached during normal driving conditions and in the event of impact. This mounting position is crucial for the bumper's functionality in terms of impact resistance and overall vehicle safety.

Regarding the other options, while the reinforced panel or impact zone may relate to the bumper's design and purpose, they do not serve as the primary mounting location. The grill is primarily for airflow and aesthetic purposes, rather than for mounting structural components like the bumper.