In a catalytic conversion of \[{{N}_{2}}\] to \[N{{H}_{3}}\] by Haber's process, the rate of reaction was expressed as change in the concentration of ammonia per time is \[40\times {{10}^{-3}}\,mol\,litr{{e}^{-1}}{{s}^{-1}}\]. If there are no side reaction, the rate of the reaction as expressed in terms of hydrogen is (in mol \[litr{{e}^{-1}}{{s}^{-1}}\])

• A.                 \[60\times {{10}^{-3}}\]               
• B.                 \[20\times {{10}^{-3}}\]
• C.                 1.200    
• D.                 \[10.3\times {{10}^{-3}}\]