Discussion

Explanation:

At the end of the second paragraph, “a knack for communicating information about who did what to whom by modulating the sounds we make when we exhale”. This ability is unique to humans as mentioned in the passage.
This resonates with option 2.
Option 1, 3 and 4 are negated as the author has not mentioned or implied in any way that non-humans cannot use symbols, cannot communicate information or do not use sound as a means of communication.
Therefore, option 5 - all of the above - is incorrect.
Hence, the correct answer is option 2.

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