What is tonicity and how does it affect solvent flow?

• A. Tonicity is the pressure exerted by solutes and it affects the flow of solvents.
• B. Tonicity is the temperature of the solution and it affects the flow of solvents.
• C. Tonicity is the relative concentration of solutes and it affects the direction of solvent flow.
• D. Tonicity is the concentration of solvents and it affects the flow of solutes.

Answer: (C)