What is the concentration of a solution containing 2g of NaOH in 100cm3 of solution? [Na = 23, O =16, H = 1]

• A 0.40 moldm\(^{-3}\)
• B 0.50 moldm\(^{-3}\)
• C 0.05 moldm\(^{-3}\)
• D 0.30 moldm\(^{-3}\)