What is the activation energy for a reaction if its rate doubles when the temperature is raised from $20^oC$ to $35^oC$ ? <br> (R = 8.314 $J mol^{-1} K^{-1}$)

Question

( A ) 34.7 $k J mol^{-1}$
( B ) 15.1 $k J mol^{-1}$
( C ) 342 $k J mol^{-1}$
( D ) 269 $k J mol^{-1}$