Which of the following compounds are the energy carriers produced during the Krebs Cycle?

The correct answer is B, which identifies FADH2 and NADH as the energy carriers produced during the Krebs Cycle.

These two molecules play crucial roles in cellular respiration, specifically in the Krebs Cycle (also known as the Citric Acid Cycle). During this cycle, multiple reactions facilitate the oxidation of Acetyl-CoA derived from carbohydrates, fats, and proteins, leading to the reduction of NAD+ to NADH and FAD to FADH2. Both of these reduced cofactors serve as high-energy electron carriers, transferring their electrons to the electron transport chain, where their energy is used to synthesize ATP.

While ATP is indeed produced in the Krebs Cycle, it's important to recognize that it is not an energy carrier in the same context as NADH and FADH2. ATP is synthesized during the cycle but functions primarily as an energy currency, not a carrier of electrons. Other options mention compounds that either do not originate from the Krebs Cycle or do not serve the role of energy carriers, such as glucose, ADP, Acetyl-CoA, oxygen, and carbon dioxide. Thus, the role of FADH2 and NADH as direct products of the Krebs Cycle highlights their significance in the overall process of energy