It can be inferred from the passage that which of the following activities is NOT an example of a population responding to high-frequency environmental processes? A. Developing watertight jars in which to collect and store water during the rainy season B. Building multistory dwellings in low-lying areas to avoid the flash flooding that occurs each summer C. Moving a village because groundwater levels have changed over the last generation D. Trading with other groups for furs from which to make winter clothes E. Moving one's herds of grazing animals each year between summer and winter pastures