Which group of lines is most suitable to show motion in a picture?

Correct answer: Diagonal, repeated motion lines

Answer: B, diagonal repeated motion lines. Motion is suggested when lines give a clear direction and repeat the path or energy of a moving object. Diagonal lines lead the eye forward or sideways, and repeated marks can show speed, vibration, or continuing movement. B is therefore the strongest choice. A, static horizontal lines, usually communicate a level, calm, or still condition rather than active movement. C, a thick square outline, mainly defines a fixed boundary and has no directional repetition. D contains no visual line signal, so it cannot directly suggest the path of motion. Motion lines are not the object itself; they are visual clues that help the viewer imagine movement. They should support the action without hiding the main figure. Memory cue: direction plus repetition often creates the visual feeling of movement.