Answer:
Part A: C. it creates a vivid and constant impression
Part B: C. It emphasizes her loneliness
Explanation:
The repetition in the story doesn't hide the poet's feelings or make the mother seem like a strong character. Instead, it makes the mother seem weak and shows what the character really feels. It makes a constant, vivid impression of the author's thoughts.
These thoughts are those of loneliness, the author feels alone everytime that door is closed, and they represent that.