Which of the following best explains why the polymerase from the species T. aquaticus is often used for PCR? A. T. aquaticus polymerase has an optimal temperature of 68°C. B. T. aquaticus polymerase does not denature at high temperatures. C. T. aquaticus polymerase can be used more than once without degrading. D. T. aquaticus polymerase adds nucleotides to both the 3' and 5' ends of DNA.