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In the Krebs cycle, how is citric acid formed? (1 point)
O Enzymes combine hydrogen ions, oxygen, and electrons.
O Carbon dioxide bonds with a chain of coenzyme A.
O Pyruvic acid molecules are broken down by an acetyl group.
O Acetyl-CoA joins with a large molecule called oxaloacetic acid.

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Answer:

D. Acetyl-CoA joins with a large molecule called oxaloacetic acid.

Explanation:

this forms a citrate molecule, which is then oxidized and releases two carbon dioxide molecules to be fed into the cycle.