What happens if the outer contour of a glass tumbler is made equally dark everywhere?

Correct answer: The glass may appear heavy and opaque

The governing concept is edge control in transparent-object rendering. A glass tumbler has changing edge strength because light, reflections, and the background interrupt or soften parts of its contour. If the entire outline is equally dark, the drawing treats the transparent form like a solid cut-out; consequently it may look heavy and opaque. Option D is correct. A uniform dark contour does not increase transparency or automatically clarify reflections, and delicacy requires varied, selective edges.