The correct option is C Pyruvate to acetyl CoA
Pyruvatepyruvate dehydrogenase−−−−−−−−−−−−−−→Acetyl CoA
Pyruvate dehydrogenase is the enzyme that catalyzes the oxidation of pyruvate, by decarboxylating it to release carbon dioxide and it adds a coenzyme molecule to synthesize acetyl-CoA.