The correct option is D depends on the action of DNA polymerase
One of the key molecules in DNA replication are the enzymes, DNA-dependent DNA polymerases. They add nucleotides one by one to the growing DNA chain. This leads to the elongation of the DNA strand during the process of replication/DNA synthesis.
The process of eukaryotic replication occurs within the replication forks, which are small openings of the DNA helix.
The elongation of the DNA strand occurs in the 5'-3' direction of the strand being synthesised.
A primer must be synthesised by an enzyme called primase, which is a type of RNA polymerase, before DNA replication can occur.