What is the role of FADH2 in the electron transport chain?

• A. FADH2 transfers electrons to ubiquinone, which removes protons from the mitochondrial matrix.
• B. FADH2 directly pumps protons into the intermembrane space.
• C. FADH2 acts as the final electron acceptor, forming water.
• D. FADH2 synthesizes ATP from ADP and inorganic phosphate.

Answer: (A)