In the oxidation of pyruvate to acetyl coa, one carbon atom is released as co2. however, the oxidation of the remaining two carbon atoms—in acetate—to co2 requires a complex, eight-step pathway—the citric acid cycle. consider four possible explanations for why the last two carbons in acetate are converted to co2 in a complex cyclic pathway rather than through a simple, linear reaction.

Since acetyl-CoA is a 2-carbon compound, it is easier to remove electrons and produce CO2 from 2-carbon compounds than 3 or more carbon compounds.  Although it is possible to oxidize the Acetyl group which has 2 carbons of acetyl CoA into 2 CO2 molecules, this process becomes much more difficult than adding the Acetyl group to a four carbon acid to form a six carbon acid (citrate). The citrate may then be sequentially oxidized to release two CO2 molecules.

Explanation:

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be

catya your not at all which answer i've seen you do this on another question!