What is the correct meaning of sensitivity of line?

Correct answer: Changing the thickness, direction and quality of a line according to the subject and emotion

The correct answer is A: sensitivity of line means changing its thickness, direction, pressure, movement, or quality to suit the subject and feeling. A sensitive line responds to what it describes. A delicate, flowing line may suit a gentle form, while a firm, angular, broken, or energetic line may communicate tension, strength, or movement. This does not mean that one line quality is always good or another is always bad; it means the artist chooses deliberately rather than drawing mechanically. Option B is wrong because complete uniformity can limit expression, even though it may be chosen for a particular style. Option C is wrong because lines can also show movement, texture, structure, tone, and emotion, not only outer boundaries. Option D is wrong because line sensitivity is about expressive control, not simply replacing coloured areas with marks. Memory cue: sensitive line changes its voice to match what it says.