Which of the following is the most likely explanation for a situation where the ELECTRON TRANSPORT CHAIN (ETC) does not produce ATP in the presence of oxygen.  a. A toxin has disrupted the Krebs Cycle   b. A toxin has altered a protein in the ETC   c. Too much NADH has been produced in the Krebs Cycle   d. Too much NADH has been produced in Glycolysis

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