Explanation:
Increase: removing 0.5 liters of distilled water, and adding 1 mOsmol of Cl.
Decreasing: adding 1 liter of distilled water, and Adding 0.5 mOsmol of Na+ and 1 liter of distilled water.
Remained the same: Adding 1 mOsmol of Na+ and 1 liter of distilled water, Adding 0.5 mOsmol of glucose and 0.5 liters of distilled water.