Which of the following scenarios describes a situation in which diffusion no longer occurring. ⠀ ⠀ A. when there is no net movement of molecules into or out of cell. ⠀⠀⠀⠀ B. When the membrane is selectively permeable ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ C. When the molecules are very large ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ D. When there is no Brownian motion.