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My personal opinion is that this part pf the poem is about war. It mentions soldiers, and deputies and also mentions “America singing” Sometimes when soldiers went to war they would sing the national anthem and other american tunes while marching to battle.
The theme here is that his daughter has changed because of her friends. She became closer to them than her father and spends more time with them than him. The narrator wants to correct this that is why he wants to talk to her.
I think C would be the best choice