Which of the following best describes the process of diffusion?
A. the movement of molecules from and area of lower concentration to an area of higher concentration caused by adding energy.
B. the movement of molecules from an area of higher concentration to an area of lower concentration caused by adding energy
C. Movement of molecules from an area of low concentration to and area of higher concentration without energy.
D. Movement of molecules from an area of higher concentration to an area of lower concentration without energy