Which period marks the paleolithic era?

The cultural period of the Stone Age that started about 2.5 to 2 million years ago, recorded by the beginning use of tools made of chipped stone. The Paleolithic Period stopped at different times in varying parts of the world, frequently around 10,000 years ago in Europe and the Middle East. Also named the Old Stone Age.

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.