What changes occur in the carbon structure during the transformation from glucose to pyruvate?

• A. A 3-carbon pyruvate molecule is converted into a 6-carbon glucose molecule.
• B. A 6-carbon glucose molecule is oxidized to form carbon dioxide.
• C. A 6-carbon glucose molecule is split into two 3-carbon pyruvate molecules.
• D. A 3-carbon pyruvate molecule is reduced to form glucose.

Answer: (C)