In cellular metabolism, what is the main function of glycolysis?

• A. To convert glucose into pyruvate while producing a net yield of ATP and NADH
• B. To oxidize acetyl-CoA to $C_0{2}_{\mathrm{}}$ in the citric acid cycle while generating GTP
• C. To convert pyruvate into acetyl-CoA while producing NADH and releasing $C_0{2}_{\mathrm{}}$
• D. To generate ATP by transferring electrons from NADH to $O_2$ in oxidative phosphorylation

Answer: (A)