For a One-Step Reaction, the Activation Energy for the Forward

For a one-step reaction, the activation energy for the forward reaction is 40.0 kJ mol^-1, and the heat of reaction is 20.0 kJ mol^-1. Calculate the activation energy for the reverse reaction.

A) +60.0 kJ mol^-1
B) -20.0 kJ mol^-1
C) -1200 kJ mol^-1
D) +20.0 kJ mol^-1
E) +1200 kJ mol^-1