A small hole of area of cross-section 2 mm² is present near the bottom of a fully filled open tank of height 2 m. Taking g=10 m/s², the rate of flow of water through the open hole would be nearly

A. 12.6×10⁻⁶ m³/s
B. 8.9×10⁻⁶ m³/s
C. 2.23×10⁻⁶ m³/s
D. 6.4×10⁻⁶ m³/s