Read this excerpt from "Birdfoot's Grampa.” But, leathery hands full
of wet brown life,
knee deep in the summer
roadside grass,
he just smiled and said
they have places to go to
too.

How does the line "he just smiled and said” provide a clue to the theme that age brings wisdom?

Grampa is impressed with Birdfoot’s use of humor.
Grampa is sensitive to Birdfoot’s lack of knowledge.
Grampa is impatient with Birdfoot’s arguments.
Grampa is surprised by Birdfoot’s ignorance.