Statement I: Above reaction is exothermic.
Because
Statement II: Energy difference B is greater than energy difference A.

Statement I: Above reaction is exothermic as the energy of products is lower than the energy of reactants.
Statement II: Energy difference B is greater than energy difference A  as the energy of products is lower than the energy of reactants.

The energy difference B corresponds to the difference in the energy of products and transition state.
Energy difference A corresponds to the difference in the energy of transition state and reactants.
Both statements are true and second statement is correct explanation of the first statement.