Which lines are useful to show raindrops falling downward?

Correct answer: Short slanting lines

Direct answer: B is correct. In a drawing, line direction can suggest movement. Short slanting lines placed repeatedly and directed downward can make the viewer understand that rain is falling. The lines do not need to be long or heavily shaded; their angle, repetition, and downward direction are the important clues. Option A is wrong because circular curves suggest turning or circular movement, not the usual falling path of raindrops. Option B is correct because short diagonal marks can represent separate drops moving down through the air. Option C is wrong because horizontal bands suggest a flat, side-to-side direction or a solid strip rather than falling drops. Option D is wrong because dots may suggest drops or splashes, but they do not clearly show downward movement by themselves. A useful drawing habit is to keep the marks similar but not mechanically identical, so the rain looks natural while the direction remains clear. Memory cue: repeated slanting marks can show falling motion.