Magnesium is a necessary component of DNA polymerization, but is not found in the DNA molecule. What is the purpose of magnesium in the polymerization of DNA?

• A. None of these answers are correct
• B. It is a cofactor for DNA polymerase III
• C. It binds to the two leaving groups during the DNA polymerization reaction
• D. It binds nucleotides in the cytosol and helps import them into the nucleus