The warp of a fabric refers to
a. the lengthwise threads of the fabric.
b. the crosswise threads of the fabric.
c. its wrong side.
d. the outside of the fabric.

Its A. lengthwise threads of the fabric.

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.