According to my research on studies conducted by various behaviorists, I can say that based on the information provided within the question they are said to be involved with Respondant Behavior. This is a behavioral process in which you react to a certain stimuli, and is essential to the organism's survival.
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D. A and B are both way off, and if it is highlighting the negative affects, then we can assume the author wants to draw attention to stopping pollution. <span />
