In which situation would the use of a diagonal line be most appropriate?

Correct answer: Showing the motion of a running player

Correct answer: C. A diagonal line slants instead of remaining upright or level. This slant creates a visual feeling of imbalance, direction, force and movement, so it is useful when an artist wants an object to appear active or energetic. A running player is moving forward, and diagonal lines can reinforce the body’s leaning posture, the direction of the limbs or the sense of speed. Option C is therefore correct. Option A is wrong because a sleeping person is usually shown with relaxed, resting forms rather than energetic diagonals. Option B is wrong because a calm horizon is best associated with a steady horizontal line. Option D is wrong because a stable wall is more naturally represented with vertical and horizontal structural lines. A diagonal does not always mean danger or speed, but in this comparison it is the clearest sign of motion. Memory cue: diagonal lines lean into action.