Which of the following statements are incorrect?

A. Enthalpy change for a reaction is the same whether it occurs in one step or in a series of steps.
B. Combustion reactions are exothermic in nature.
C. It is impossible to relate heat of reaction to changes in energy associated with breaking and making of chemical bonds.
D. In polyatomic molecules, bond dissociation enthalpy is same for different bonds with in the same molecules.
E. In methane, all the four bonds are identical in bond length and energy.
Choose the correct answer from the option given below.