A spherical ball of iron of radius 2 mm is falling through a column of glycerine. If densities of glycerine and iron are respectively \[1.3\times {{10}^{3}}kg/{{m}^{3}}\]and\[8\times {{10}^{3}}kg/{{m}^{3}}\].\[\eta \]for glycerine \[=0.83N{{m}^{-2}}\sec \], then the terminal velocity is

• A. 0.7 m/s
• B. 0.07 m/s
• C. 0.007 m/s
• D. 0.0007 m/s