Which of the following, if true, would make the information presented in the passage compatible with the experimental flood's in fact having caused substantial flushing of native fish? A. Many of the native fish are too small to have been captured by the nets. B. There had been and increase from normal levels in the native fish population prior to the flood. C. The native fish in the Colorado are much stronger swimmers than taxonomically similar fish in other rivers in the region. D. The unintentional flood of 1983 had not affected the river's trout population as much as was originally thought. E. The experimental flood raised the water level much less than a typical natural flood would have.