The process of DNA replication is essential for cell division and occurs in three main stages: initiation, elongation, and termination. During initiation, specific enzymes like helicase unwind the DNA, making the strands accessible for replication. The enzyme DNA polymerase then synthesizes a new strand by adding nucleotides complementary to the template strand during elongation. Ultimately, termination results in the completion of two identical DNA molecules.

Which of the following enzymes is primarily responsible for adding nucleotides to the growing DNA strand during the elongation phase of DNA replication?