Which of the following statement is correct about diffusion?

• A.it involves movement of water molecules only
• B.Molecules move from a region of higher concentration to a region of lower concentration
• C.differentially permeable membrane must be present for diffusion to occur
• D.It involves when a solute can no longer dissolve in a solvent of only solute molecules into the Bowman's capsule
• E.It occurs when a solute can no longer dissolve in a solvent