Which is the correct difference between outline and contour line?

Correct answer: An outline shows only the outer boundary of an object, whereas a contour line can also show form and surface variations

Correct answer: A. An outline is a line that marks the outside boundary of a visible shape, separating it from the surrounding space. A contour line has a broader use: it can follow the outer edge, but it can also travel across or around a form to suggest its curves, folds, turns, or changes in surface. This is why contour drawing can help the viewer understand the structure of an object, even without shading. A is correct because it gives the essential distinction. B is wrong because outlines and contour lines do not primarily identify shaded areas or colour blending. C is wrong because both are useful descriptive drawing tools, not merely decoration. D reverses the functions: an outline is not an internal-texture line, and contour lines are not restricted only to the outer edge. Memory cue: outline tells where the shape ends; contour can help explain how the form turns.