Song suggestions?? No BTS or stuff like that:/

i would say the answer is b. zigzag lines of the leaves. i believe this is the answer because zigzag lines go in different direction while the other options like: the vertical lines of the trees, the dotted lines on the road, and the curved lines of the park benches go in one direction.

i believe their role is to instruct certain sections on when they are to join and when they are to stop