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The passage states that: “As they become more reliant on human food they might find at campsites or in rubbish bins, they become less avoidant of humans. Losing that instinctive fear response puts them into more situations where they could get into an altercation with a human, which often results in that bear being put down by humans." This means that the factor contributing most to carnivores' habituation to human presence is the reduction in instinctive fear response and reliance on human food sources, which is evident in option d.
Option a: The passage does not mention their natural aggression. It focuses more on losing fear due to food reliance on human food.
Option b: The passage mentions climate change as a possible reason for increased conflict, but it doesn't suggest it directly contributes to loss of fear or habituation.
Option c: The passage does not mention about the predatory perception of humans as potential prey, hence eliminated.
Hence, option d is the correct answer.