Here's why:

* DNA polymerase is responsible for synthesizing new DNA strands. It does this by reading the existing DNA strand and adding complementary nucleotides to create a new strand.

* Base pairing rules dictate the matching:

* Adenine (A) pairs with Thymine (T)

* Guanine (G) pairs with Cytosine (C)

So, DNA polymerase is the key player in ensuring accurate replication of DNA by matching the correct bases.