The following solutions were prepared by dissolving 10 g of glucose ( C6H12O6 ) in 250 ml of water ( P 1 ), 10 g of urea ( CH4N2O ) in 250 ml of water ( P 2 ) and 10 g of sucrose ( C12H22O11 ) in 250 ml of water ( P 3 ). The right option for the decreasing order of osmotic pressure of these solutions is :

1. A. P 1 > P 2 > P 3
2. B. P 2 > P 3 > P 1
3. C. P 3 > P 1 > P 2
4. D. P 2 > P 1 > P 3

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