Which quality of line is important in calligraphy?

Correct answer: Beautiful change of thick and thin

Direct answer: A, a beautiful change between thick and thin is an important line quality in calligraphy. Calligraphy treats writing as visual design: the letters must remain readable while their strokes create rhythm, contrast, and elegance. Variation may come from the writing tool, its angle, pressure, or the planned construction of the letters. A is correct because controlled contrast gives strokes character and helps form a graceful letter structure. B is irrelevant because paper price is not a line quality. C concerns a frame, not the written mark. D concerns smell and has no role in the visual quality of a calligraphic line. Memory cue: calligraphy combines readable letters with controlled stroke variation.