Which of the following statements about drinking a solution of mannitol is incorrect?

• A. Mannitol is freely filtered through the glomerular capillaries.
• B. Mannitol decreases the osmolarity of the tubular fluid.
• C. Mannitol increases the water flow into the tubules.
• D. Mannitol increases the concentration of solute particles of the fluid in the tubules.

Answer: (B)