This type is used to represent an edge or object not visible to the viewer

• A. Center line
• B. Visible line
• C. Hidden line
• D. Section line

Answer: (C)

Edges that are not visible in the current view are shown as hidden lines. In engineering drawing, hidden lines use a dashed pattern to indicate features behind or inside the part—such as holes, internal slots, or backside edges—so you understand the full geometry without turning the part.

This is why the hidden line is the correct choice: it specifically communicates invisible features. Other line types have different roles—visible lines are solid to show what you can actually see, center lines mark symmetry or axes, and section lines indicate surfaces created by cutting the object.