Shirley went for a run. During her run, her body was creating energy so that she could go a longer distance. Which step of cellular respiration converts each of her glucose molecules into pyruvic acid

Shirley went for a run. During her run, her body was creating energy so that she could go a longer distance. Which step of cellular respiration converts each of her glucose molecules into pyruvic acid? citric acid cycle glycolysis electron transport chain phosphorylation