The best phrase that states a theme of Bird foot's Grampa is With age comes wisdom.
What do you mean by theme?
A theme refers to the idea of the subject of a talk, a piece of writing, etc.
The theme of Bird foot's grampa states that all living things have value and should value every life. She is also a strong believer to live selflessly and never give up.
The theme of Birdfoot's Grampa is With age comes wisdom. Therefore, D is the correct option.
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