No two performances of the unanswered question are the same because a. it's unmetered. b. orchestras are different sizes. c. charles ives never wrote it down. d. it's improvised.

The correct answer is because orchestras are different sizes.

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.