A large tank is filled with water to a height H. A small hole is made at the base of the tank. It takes \[{{T}_{1}}\] time to decrease the height of water to \[\frac{H}{\eta }\,(\eta >1)\]; and it takes \[{{T}_{2}}\] time to take out the rest of water. If \[{{T}_{1}}={{T}_{2}}\], then the value of \[\eta \] is

• A.             2     
• B.             3
• C.             4     
• D.             \[2\sqrt{2}\]