Which of the following body panels is considered part of the front-end sheet metal?

The fender is considered part of the front-end sheet metal because it is located on the side of the vehicle, just forward of the door and over the front wheels. Its primary function is to protect the vehicle from dirt, debris, and damage that occurs during driving, while also contributing to the vehicle's overall aesthetic and aerodynamic design. In the context of body panels, front-end sheet metal refers specifically to components that make up the front section of the vehicle's exterior, which includes the fender, hood, and sometimes the front fascia.

Other mentioned body panels do not classify as part of the front-end sheet metal. The quarter panel is located at the rear of the vehicle and serves a different purpose. The roof is the upper structure of the car that covers the passenger compartment, while the floor pan forms the bottom of the car body. These components are integral to the vehicle but do not fall under the category of front-end sheet metal, which is crucial for impact absorption and protection in front-end collisions.