Exam Guidelines Exam Instructions Question 4 of 20 : Select the best answer for the question: 4. After writing and balancing the equation, what's the next step in using bond energies to calculate the enthalpy of a reaction? O A. Sum the bond energies of the products. B. Write down the bond energies for the products and reactants. O C. Write the fructures of the products and reactants. O D. Subtract the bond energies of the products from the reactants.​