Answer: C
Explanation: The DNA Polymerase is an enzyme that adds one nucleotide at a time to the -OH free 3' end of a forming DNA strand. These nucleotides match to the ones from another DNA strand, which is used as a model. As soon as the complementary chain has been made, another DNA polymerase will repeat the process on it, to make its matching strand, which should be the same as the first one used as a model. Two DNA work on each of the two DNA separated strands, to make a copy of the other one.