$5.0 \ g$ of sodium hydroxide (Molar mass $40 \ g \ mol^{-1}$) is dissolved in a small quantity of water and the solution is diluted up to $100 \ mL$. What is the molarity of the resulting solution?
- A$0.1 \ mol \ dm^{-3}$
- B$1.0 \ mol \ dm^{-3}$
- C$0.125 \ mol \ dm^{-3}$
- D$1.25 \ mol \ dm^{-3}$
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