The word lyric can refer to all of the following except
a. the words of a song
c. an expression of emotion
b. all stringed instruments
d. a type of poetry

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.