What is 'Psychic Numbing'

Psychic numbing is a tendency for people or societies to withhold focus from stressful past events, or from potential risks that are considered to have massive, but low possibility, effects.

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.