$25.3\text{g}$ of sodium carbonate, ${\text{Na}}_2{\text{CO}}_3$ is dissolved in enough water to make $250\text{mL}$ of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion, ${\text{Na}}^{+}$ and carbonate ions, ${\text{CO}}_3^{2-}$ are respectively: (Molar mass of ${\text{Na}}_2{\text{CO}}_3=106{\text{g mol}}^{-1}$)

1. A
   $0.477\text{M}$ and $0.477\text{M}$
2. B
   $0.955\text{M}$ and $1.910\text{M}$
3. C
   $1.910\text{M}$ and $0.955\text{M}$
4. D
   $1.90\text{M}$ and $1.910\text{M}$