Answer: d. glucose
Explanation:
Cellular respiration starts with a process called glycolysis. Glycolysis breaks down one molecule of glucose into two molecules of pyruvate. Then pyruvate oxidates and forms Acetyl CoA, which enters the citric acid cycle and ends up producing 36 ATP molecules that will be used as energy by the cell.
Other sugars can enter the cycle but must be turned into some intermediate molecule first. For example, fructose must be turned into fructose-6-phosphate, the third molecule used in glycolysis.
