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Explanation:

The main aim in writing the passage is to demonstrate how the destruction of the elephant society has led to unpredictable asocial behaviour and hyper-aggression in elephants. Though the first sentence of the third sentence clearly states that humans are social animals, it is not the main aim of the passage. Negate option 1. Only the first sentence of the passage states the changing relationship between humans and elephants. The rest of the passage talks about how elephant behaviour has changed due to the loss of elephant herds. Thus option 2 can also be negated. Option 3 correctly expresses the overall argument of the passage. Retain it. Option 4 is incorrect as only the last statement compares the brain organisation and early development of humans and elephants.
Hence, the correct answer is option 3.