The top of a water tank is open to air and its water level is maintained. It is giving out 0.74 m3 water per minute through a circular opening of 2 cm radius in its wall. The depth of the centre of the opening from the level of water in the tank is close to:

• A. 6.0 m
• B. 4.8 m
• C. 9.6 m
• D. 2.9 m