Music appreciation the early twentieth century atonal music uses no  a.  voices.      b.  melody.      c.  feeling.      d.  key.

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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.