What type of mechanical drawing shows the details of a part?

The correct choice is detail drawing, which specifically provides a comprehensive representation of a single part or component, including all necessary dimensions, specifications, and annotations needed for manufacturing or fabrication. Detail drawings are crucial in engineering and manufacturing as they convey precise information about the physical characteristics of the component, such as size, shape, material, and finishes.

In contrast, blueprint drawings usually refer to a reproduction of architectural or engineering designs that can include both details and assemblies but are not exclusively focused on single parts. Assembly drawings depict how multiple components come together to form a complete unit. They provide an overview of the arrangement and relationship between different parts rather than the intricate details of one specific part. 3D modeling involves creating a virtual representation of an object in three dimensions, which can be useful for visualizing the part but doesn't necessarily provide the detailed specifications needed for actual manufacturing processes. Therefore, detail drawings are essential for ensuring accuracy and clarity in part production.