The following solutions were prepared by dissolving \( 10 g \) of glucose \( \left( C _{6} H _{12} O _{6}\right) \) in \( 250 \,ml \) of water \( \left( P _{1}\right) \) \( 10 \,g \) of urea \( \left( CH _{4} N _{2} O \right) \) in \( 250 \,ml \) of water \( \left( P _{2}\right) \) and \( 10 g \) of sucrose \( \left( C _{12} H _{22} O _{11}\right) \) in \( 250\, ml \) of water \( \left( P _{3}\right) \) . 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) \( P _{3}> P _{1}> P _{2} \)