Which detail expresses the theme of this story?

"frustrated by his brother’s passiveness, ennis eventually gave up trying to lure emerson to participate in the real world and left his brother to his own devices."

"after a while, we sat around talking about different things we were interested in."

"arguing with emerson wasn’t working, reasoning didn’t seem to , and it seemed unlikely that they would ever understand each other."

'"what i’m saying is, for this afternoon only, i do what you normally do, and you do what i normally do.'"