The dissociation constants for acetic acid and $\text{HCN}$ at $25^{\circ }\text{C}$ are $1.5\times 10^{-5}$ and $4.5\times 10^{-10}$ respectively. The equilibrium constant for the equilibrium ${\text{CN}}^{-}+{\text{CH}}_3\text{COOH}\rightleftharpoons \text{HCN}+{\text{CH}}_3{\text{COO}}^{-}$ would be:

1. A
   $3.0\times 10^{-5}$
2. B
   $3.0\times 10^{-4}$
3. C
   $3.3\times 10^4$
4. D
   $3.0\times 10^5$