A small hole of area of cross-section $2{\text{mm}}^2$ is present near the bottom of a fully filled open tank of height $2\text{m}$. Taking $g=10{\text{m/s}}^2$, the rate of flow of water through the open hole would be nearly:

1. A
   $12.6\times 10^{-6}{\text{m}}^3\text{/s}$
2. B
   $8.9\times 10^{-6}{\text{m}}^3\text{/s}$
3. C
   $2.23\times 10^{-6}{\text{m}}^3\text{/s}$
4. D
   $6.4\times 10^{-6}{\text{m}}^3\text{/s}$