Trace the pathway of electrons from NADH through the electron transport chain, identifying the role of each complex and electron carrier.

• A. NADH donates electrons to Complex II, which are then transferred to ubiquinone, Complex III, cytochrome c, and finally Complex IV.
• B. NADH donates electrons to Complex IV, which are then transferred to ubiquinone, Complex III, cytochrome c, and finally Complex I.
• C. NADH donates electrons to Complex I, which are then transferred to ubiquinone, Complex III, cytochrome c, and finally Complex IV.
• D. NADH donates electrons to Complex III, which are then transferred to ubiquinone, Complex I, cytochrome c, and finally Complex IV.

Answer: (C)