The time required for 10% completion of a first order reaction at 298 K is equal to that required for its 25% completion at 308 K, If the pre-exponential factor for the reaction is \[3.56\times {{10}^{9}}{{s}^{-1}}\] the rate constant at 318 K is:

• A. \[18.39\text{ }kcal\text{ }mo{{l}^{-1}}\]  
• B.   \[20\,kcal\,mo{{l}^{-1}}\]
• C. \[16\,kcal\,mo{{l}^{-1}}\]        
• D. \[21.5\,kcal\,mo{{l}^{-1}}\]