How can you express the color black without using it. For example in a drawing, but you are not allowed to use the color black.

Explanation:

Make a drawing of a rainy day, a funeral, something sad like that

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.