Why does a new DNA strand elongate only in the 5' to 3' direction during DNA replication?a.DNA polymerase begins adding nucleotides at the phosphate group of the template.b.DNA polymerase can add nucleotides only to the 3' hydroxyl group.c.DNA polymerase can add nucleotides only to the 3' phosphate group.d.Replication must progress toward the replication fork.