During DNA replication, a primer attaches to a template strand of DNA and begins a new strand. After the primer has attached, an enzyme extends the new strand of DNA by adding nucleotides that correspond to the nucleotide sequences in the template strand.

Which enzyme is responsible for adding nucleotides to the growing DNA molecule?
A.
DNA helicase
B.
DNA structase
C.
DNA isomerase
D.
DNA polymerase