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What is the difference between osmosis and diffusion?

a. Diffusion is the movement of molecules from an area of low concentration to an area of high concentration; osmosis is the opposite.

b. Osmosis is the movement of molecules from an area of low concentration to an area of high concentration; diffusion is the opposite.

c. Diffusion is the movement of water across a membrane; Osmosis is the movement of molecules from a higher to a lower concentration, with or without the presence of a membrane.

d. Osmosis is the movement of water across a membrane; diffusion is the movement of molecules from a higher to a lower concentration, with or without the presence of a membrane.