The following solutions were prepared by dissolving $10 \ g$ of glucose $(C_{6}H_{12}O_{6})$ in $250 \ mL$ of water $(P_{1})$,$10 \ g$ of urea $(CH_{4}N_{2}O)$ in $250 \ mL$ of water $(P_{2})$,and $10 \ g$ of sucrose $(C_{12}H_{22}O_{11})$ in $250 \ mL$ of water $(P_{3})$. The right option for the decreasing order of osmotic pressure of these solutions is:

• A
  $P_{2} > P_{1} > P_{3}$
• B
  $P_{1} > P_{2} > P_{3}$
• C
  $P_{2} > P_{3} > P_{1}$
• D
  $P_{3} > P_{1} > P_{2}$