Which is a text clue that helps readers understand the theme of age bringing wisdom in "Birdfoot's Grampa”?

Grampa’s calm response to Birdfoot’s argument suggests the patience and understanding that can come with age. His smile shows that he does not need to argue back to make his point. Choice C, “Grampa just smiles when Birdfoot argues with him,” best supports the theme of age bringing wisdom.

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