Hansberry names the play after a line in the poem "Harlem" (sometimes called "Dream Deferred"), by the great Harlem Rennaisance poet Langston Hughes. In the poem, Hughes asks: "What happens to a dream deferred?/ Does it dry up/ like a raisin in the sun?"
Answer:
If Francisco is the one narrating the book, then it shows that he looks up to Roberto. He thinks Roberto is brave. He also thinks he is not as good as Roberto.
I hope this helps!
Word choice is the answer