Refer to the Figure Below Showing the Diffusion of a Substance

Multiple Choice

Refer to the figure below showing the diffusion of a substance into a cell over time. What kind of arrows, if any, should be shown in the part of the figure labeled B?

A) No arrows
B) Two medium-sized arrows, one pointing into the cell and the other pointing out
C) One small arrow pointing into the cell and one large arrow pointing out
D) One large arrow pointing into the cell and one small arrow pointing out
E) One small arrow pointing into the cell and no other arrow