Neville is testing a hypothesis through experimentation. He believes that raising the temperature difference between two water samples will lead to stronger circular currents when the samples are mixed together. Which of these actions would be considered a mistake in Neville’s experiment? A. He measures the strength of each current using the same flow meter. B. He randomly varies the volume of hot and cold water across his trials. C. He reruns the experiment after fixing calibration problems with his thermometers. D. He uses glass containers to hold the water samples instead of plastic ones. E. He states his hypothesis prior to beginning any of his experimental trials.