The stage of cellular respiration that produces the most ATP is:
C. Electron transport
The electron transport chain (ETC) generates the majority of ATP during cellular respiration, primarily through oxidative phosphorylation. This process utilizes the proton gradient created by electrons being transferred through the chain to synthesize ATP via ATP synthase.
While glycolysis and the Krebs cycle produce some ATP, the amounts are significantly lower compared to what is generated during the electron transport stage. Acetyl-CoA charging does not produce ATP directly.
So, the answer is primarily:
C. Electron transport