4. For a reversible reaction A + B ⇌ C + D, the enthalpy change and activation energy of theforward reaction are -20.0 kJ/mol and 85.0 kJ/mol, respectively. What is the activation energyof the reverse reaction?
(A)65.0 kJ/mol
(B) -105.0 kJ/mol
(C) -65.0 kJ/mol
(D) 105.0 kJ/mol
(E) 130.0 kJ/mol.