Each Round of the Citric Acid Cycle Begins When the Four-Carbon

Each round of the citric acid cycle begins when the four-carbon molecule oxaloacetate is converted to the six-carbon molecule citrate. As the cycle progresses, two carbons are eliminated to regenerate the oxaloacetate. The added carbon is supplied by _____ and the two eliminated carbons are released as _____.

A) ATP; acetyl-CoA
B) CO₂; pyruvate
C) acetyl-CoA; CO₂
D) CO₂; NADH
E) CO₂; acetyl-CoA