You Go See a Movie at Mid-Day to Have the Theater

Multiple Choice

You go see a movie at mid-day to have the theater to yourself. To your dismay, a guy wearing a great deal of a foul cheap cologne sits next to you. You move a few seats away to escape the odor. You keep moving farther and farther from where the guy is sitting until the smell is tolerable. Your movement in seating illustrates the

A) electrical gradient.
B) release of neurotransmitters.
C) concentration gradient.
D) ion flux.