Since the sequencing of DNA by the chain-termination method utilizes DNA polymerase I to make a copy of a target DNA molecule, if one 5 bp terminated product of a 20 bp target ends with a dideoxyadenosine, then we can conclude that the target must have: A) a cytosine at position 5 B) a thymidine at position 5 C) a cytosine at position 16 D) a thymidine at position 16 E) a uridine at position 5