Answer:
The correct answer is- E) substrate-level phosphorylation
Explanation:
In substrate-level phoshorylation ATP is produced by the addition of a phosphate group to ADP by a phosphorylated intermediate formed during the reaction not from any inorganic molecule like in the case of oxidative phosphorylation.
In glycolysis 4 ATP are generated through substrate-level phosphorylation. For example when 1,3 phosphoglycerate converts into 3 phosphoglycerates and when phosphoenol pyruvate converts into pyruvate ATP is produced through substrate level phosphorylation. Therefore the correct answer is E.