D) Chimpanzees use tools in the same way humans do.
Explanation:
The phrase from the passage which BEST supports the student's generalization that chimps are the smartest animals alive is: chimpanzees use tools in the same way humans do. This was considered one of the most stunning and important observations Goodall made about chimps and could easily make the student generalize that chimps, being like humans in this way, are 'the smartest animals alive.'
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