A monoatomic ideal gas is expanded adiabatically to n times of its initial volume. The ratio of final rate of collision of molecules with the unit area of container walls to the initial rate will be

• A. \[{{n}^{-4/3}}\]
• B. \[{{n}^{4/3}}\]
• C. \[{{n}^{2/3}}\]
• D. \[{{n}^{-2/3}}\]