Answer:
The correct answer would be B-alcohol fermentation.
Alcohol fermentation or ethanol fermentation is a type of anaerobic respiration by which organism (such as yeast) convert sugar such as glucose, sucrose et cetera into ethanol and carbon dioxide in order to produce energy.
First, glucose is converted into 2 molecules of pyruvate by the process of glycolysis. It leads to the formation of 2 molecules of ATP (adenosine triphosphate) and 2 molecules of NADH.
Then, two molecules of pyruvate are converted into two molecules of acetaldehyde with the help of enzyme pyruvate decarboxylase. Two molecules of carbon dioxide are released as a byproduct.
Lastly, two molecules of acetaldehyde are converted into two molecules of ethanol with the help of enzyme alcohol dehydrogenase. It consumes two NADH and regenerates two NAD⁺ lost during the process of glycolysis.
Hence, the net gain of alcohol fermentation is two ATP.
Thus, we can say that ethanol is produced during alcohol fermentation.
