Are keyboards/synthesisers used in No Woman No Cry by Ken Boothe

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.

correct answer is b "write as much as you can about the subject so you might earn extra-credit points"