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 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

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