You eat a candy bar to get you through a late-night studying session. Your body quickly begins to break down the macromolecules in the candy, using the sugars, lipids, and protein to make ATP. Referring to the steps described below, what is the correct order of this process?

a. First Step: The sugars are broken down to simple glucose molecules and the proteins and lipids are broken down to acetyl-CoA molecules. No energy is produced in this first step.

b. Second Step: Glycolysis converts the glucose to two molecules of pyruvate. Six ATP molecules are produced in this step.

c. Third Step: Oxidation of each pyruvate produces two molecules of acetyl-CoA. Six ATP molecules are produced in this step.

d. Fourth Step: Two acetyl-CoA molecules go through the Krebs (citric acid) cycle. Twenty-four ATP molecules are produced through this process.

e. All of the above steps are part of the break down of the candy bar's macromolecules.