Which of the following is a true statement about osmosis? A. Osmosis is diffusion of sugar molecules across a membrane. B. Osmosis is diffusion of water molecules across a membrane. C. Osmosis is diffusion in plants cells. D. Osmosis is diffusion in animal cells.

B because osmosis is the process that doesn't require energy. Sugar molecules have nothing to do with it and neither does the type of membrane

B, because

osmosis is the process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one, thus equalizing the concentrations on each side of the membrane.

or in easier terms diffusion of water