A leaf fell from a tree branch. The path it followed is shown in the diagram below.

Which of these best describes why the leaf fell in a crooked path instead of straight down?

A) Objects with irregular shapes never fall in straight lines.

B) Air currents and gravity applied changing and unbalanced forces to the leaf

C) The upward force of the air on the leaf was greater than the downward force of gravity.

D) Once the leaf was in motion, it continued moving in the same direction because the forces were balanced.