The molarity of urea (molar mass $60 \ g \ mol^{-1}$) solution obtained by dissolving $15 \ g$ of urea in $500 \ cm^3$ of water is
- A$0.5 \ mol \ dm^{-3}$
- B$0.25 \ mol \ dm^{-3}$
- C$0.125 \ mol \ dm^{-3}$
- D$0.0005 \ mol \ dm^{-3}$
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