What were the three main purposes for which Leonardo used drawing?

Though many of his inventions were impractical, Leonardo was fascinated by the inner workings of things, be they machine or man, and used his drawings to support himself throughout his life.

Explanation:

sorry if this doesnt answer it

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.

lithograph is created by etching the flat surface of a print.