DNA Polymerase Catalyzes the Joining of a Nucleotide to a Growing

Multiple Choice

DNA polymerase catalyzes the joining of a nucleotide to a growing DNA strand.What prevents this enzyme from catalyzing the reverse reaction?

A) hydrolysis of pyrophosphate (PP_i) to inorganic phosphate (P_i) + P_i
B) release of PP_i from the nucleotide
C) hybridization of the new strand to the template
D) loss of ATP as an energy source