Which of the following solutions will generate the highest osmotic pressure?

Determine the van 't Hoff factor ($i$) for each solute: NaCl dissociates into 2 ions (Na⁺ and Cl^-), so $i=\; 2$; CaCl₂ dissociates into 3 ions (Ca²⁺ and 2 Cl^-), so $i=\; 3$; glucose and urea do not dissociate, so $i=\; 1$ for both.

Since all solutions have the same molarity (0.1 M) and are assumed to be at the same temperature, compare the osmotic pressures by comparing the van 't Hoff factors: the solution with the highest $i$ will have the highest osmotic pressure.