Answer: c) Researchers think that stresses created by humans are the reason behind increasing numbers of elephant attacks.
Explanation:
The aforementioned article by National Geographic shows that the higher number of elephant attacks on humans are as a result of human activities that are placing stress on elephants.
Humans are increasing in population and as a result need more land for farming. This is resulting in a shrinking habitat for elephants who then encroach on human farms and are killed for it which leads to some elephants having Post Traumatic Stress Disorder and killing other humans which then continues the cycle.
In 2006, she described to National Public Radio her experience watching cattle get vaccinated at feedlots during the 1970s. Some of the animals would just walk into the holding chutes, she said, while others refused. So Grandin did what no one else had bothered to do before: She went into the chutes herself.