When $10 \ g$ of glucose (osmotic pressure $P_1$),$10 \ g$ of urea (osmotic pressure $P_2$),and $10 \ g$ of sucrose (osmotic pressure $P_3$) are dissolved in $250 \ mL$ of water,the correct relationship between the osmotic pressures of these solutions is:
- A$P_1 > P_2 > P_3$
- B$P_3 > P_1 > P_2$
- C$P_2 > P_1 > P_3$
- D$P_2 > P_3 > P_1$
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