Use the Following Information to Answer the Next Questions

Use the following information to answer the next questions.
In the presence of oxygen, the three-carbon compound pyruvate can be catabolized in the citric acid cycle. First, however, the pyruvate 1) loses a carbon, which is given off as a molecule of CO₂, 2) is oxidized to form a two-carbon compound called acetate, and 3) is bonded to coenzyme A.
-Why is coenzyme A, a sulfur containing molecule derived from a B vitamin, added?

A) because sulfur is needed for the molecule to enter the mitochondrion
B) in order to utilize this portion of a B vitamin which would otherwise be a waste product from another pathway
C) to provide a relatively unstable molecule whose acetyl portion can readily bind to oxaloacetate
D) because it drives the reaction that regenerates NAD⁺
E) in order to remove one molecule of CO₂