Which musical tool instills balance and resolution, returning the listener to familiar components?

I believe that would be a metronome.

Explanation:

Even though the metronome can frustrate me at times, constantly nagging at me for playing to quickly. The truth is that it puts me at peace and clears my head.

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.