In aqueous solution the ionization constants for carbonic acid are $K_1=4.2\times 10^{-7}$ and $K_2=4.8\times 10^{-11}$. Select the correct statement for a saturated $0.034\text{M}$ solution of the carbonic acid.

1. A
   The concentration of ${\text{CO}}_3^{2-}$ is $0.034\text{M}$.
2. B
   The concentration of ${\text{CO}}_3^{2-}$ is greater than that of ${\text{HCO}}_3^{-}$.
3. C
   The concentration of ${\text{H}}^{+}$ and ${\text{HCO}}_3^{-}$ are approximately equal.
4. D
   The concentration of ${\text{H}}^{+}$ is double that of ${\text{CO}}_3^{2-}$.