Frank should use a (BLANK) system to organize content on a cover page. Doing so, Frank can divide a cover page into columns and inter-column spaces.

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.