Read this excerpt from the story "Thank You, Ma'am.”The boy wanted to say something else other than "Thank you, ma’am" to Mrs. Luella Bates Washington Jones, but he couldn’t do so as he turned at the barren stoop and looked back at the large woman in the door. He barely managed to say "Thank you" before she shut the door. And he never saw her again.What theme is suggested by this excerpt?