What effect occurs when a uniformly thick line is drawn around a round object?

Correct answer: The object will appear flat and cut out

The governing concept is contour variation in observational drawing. A round form gains depth when its edges respond to light, overlap, and turning surfaces; some edges may be lighter, softer, or partly lost. An equally heavy outline gives every boundary the same emphasis, separating the object like a symbol or cut-out. Thus option C is correct, while it cannot increase transparency, roundness, or soften the cast shadow.