Which answer most correctly states the effect of line?

Correct answer: Diagonal lines suggest movement, energy and dynamism

Correct answer: C. Lines do more than outline objects; their direction influences how viewers feel and how the eye moves. Diagonal lines contain a sense of tilt and direction, so they commonly suggest movement, action, energy, or instability. C states this relationship correctly. A is generally true about horizontal lines, which often suggest rest, calm, or stability, but it is not the best answer when the question asks for the most correct statement among the choices because C gives the strongest accurate line-effect pairing. B is wrong because vertical lines commonly suggest height, strength, dignity, or stability rather than making an object short and unstable. D is wrong because curved lines often suggest softness, flow, grace, or organic movement, not only rigidity. Memory cue: horizontal rests, vertical rises, diagonal moves, and curved lines flow.