A rain drop of radius 0.3mm falling vertically downwards in air has a terminal velocity of 1 m/ s. The viscosity of air is\[18\times {{10}^{-5}}poise\]. The viscous force on the drop is

• A. \[101.73\times {{10}^{-4}}dyne\]
• B. \[101.73\times {{10}^{-5}}dyne\]
• C. \[16.95\times {{10}^{-5}}dyne\]
• D. \[16.95\times {{10}^{-4}}dyne\]