A small hole of area of cross-section 2 `mm^(2)` present near the bottom of a fully filled open tank of height 2. Taking g=`10m//s^(2)`, the rate of flow of water through the open hole would be nearly
A. `6.4xx10^(-6)m^(3)//s`
B. `12.6xx10^(-6)m^(3)//s`
C. `8.9xx10^(-6)m^(3)//s`
D. `2.23xx10^(-6)m^(3)//s`
