The correct answer is C. Glucose.
Glucose is a simple sugar that is the body’s main source of energy. It is broken down into pyruvate in the cytoplasm of cells, and then into acetyl-CoA in the mitochondria. Acetyl-CoA is then used in the Krebs cycle to produce ATP, the body’s energy currency.
Proteins and fats are also broken down into smaller molecules that can be used to produce energy, but they are not as efficient as glucose. Proteins are broken down into amino acids, and fats are broken down into fatty acids and glycerol. Amino acids and fatty acids can be used to produce acetyl-CoA, but they require more steps than glucose does. Glycerol can be used to produce pyruvate, but it is not as efficient as glucose.
Alkanes are hydrocarbons that do not contain any oxygen. They are not broken down by the body for energy.
In conclusion, glucose produces the highest amount of energy upon oxidation.