Which of the following pairs of solutions is isotonic? (Molar mass: urea $= 60 \ g \ mol^{-1}$,sucrose $= 342 \ g \ mol^{-1}$)
- A$3.0 \ g \ L^{-1}$ urea and $17.19 \ g \ L^{-1}$ sucrose
- B$0.3 \ g \ L^{-1}$ urea and $1.719 \ g \ L^{-1}$ sucrose
- C$3.0 \ g \ L^{-1}$ urea and $1.719 \ g \ L^{-1}$ sucrose
- D$0.3 \ g \ L^{-1}$ urea and $17.19 \ g \ L^{-1}$ sucrose
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