Which option shows contrast in both direction and movement?

Correct answer: A diagonally flying bird before still vertical trees

The governing concept is contrast created by opposing visual directions and actions. In option C, the trees are upright and still, whereas the bird moves diagonally across the scene. This gives both a directional difference—vertical versus diagonal—and a movement difference—stationary versus moving—so C is correct. The other options show similarity, stillness, or repeated curves rather than two clear kinds of contrast.