Which components are included in the side and rear parts of a vehicle?

The inclusion of side door panels and internal pieces reflects an accurate understanding of the components that make up the side and rear parts of a vehicle. Side door panels are a fundamental part of the vehicle's structure, contributing to both the aesthetic appeal and structural integrity, as they house the window mechanisms and provide access to the interior of the vehicle.

Additionally, the internal pieces often referenced in this context can include elements such as door trim, window regulators, and various hardware that are essential for the functionality of the doors and the overall safety of the vehicle. These internal components play crucial roles in enhancing user experience, safety features like side-impact protection, and sound insulation.

The other options do not pertain to the side and rear areas of the vehicle as directly: windshields and roof panels are primarily top and front components; front bumpers and dashboards are associated with the front of the vehicle; and engine and transmission parts are located in the front section, typically under the hood. Hence, the correct choice correctly identifies components integral to the side and rear aspects of a vehicle.