In the context of passive transport and membrane permeability, what does a reverse osmosis device primarily remove from water?

• A. Only large suspended particles, while leaving dissolved ions unchanged
• B. Water molecules, while allowing salts and ions to pass through the membrane
• C. Dissolved solutes such as ions and other small dissolved contaminants
• D. Only dissolved gases such as $O_2$ and $C_{O_2}$

Answer: (C)