What can be suggested by a stroke changing from thick to thin?

Correct answer: A change in pressure, speed, or distance

Direct answer: A thick-to-thin stroke can suggest a change in pressure, speed, or distance, so A is correct. Line quality is not always constant. When an artist presses harder, the mark may become darker or thicker; lighter pressure can produce a thinner mark. A change in speed can also alter the character of a stroke. In some drawings, a gradual change in thickness helps suggest turning surfaces, movement, or spatial depth. B is wrong because a changing stroke does not automatically mark the end of a subject. C is the opposite of the idea: variation often increases expression. D is wrong because complete stillness and uniform force would more likely produce a fairly consistent line. The exact result also depends on the tool and material, but the main artistic idea is controlled variation. Memory cue: changing line weight often means changing force, movement, or visual depth.