What does the bird in the poem represent in the story? (Paragraph 38)

“Nothukula? It’s your turn,” Ms. Johnson said, interrupting her thoughts. Nothukula had chosen one of her favorite poems, Paul Laurence Dunbar’s “Sympathy,” and she had it memorized. She replayed it in her mind:

A
The bird represents Nothukula’s confidence in being away from Zimbabwe for the first time.
B
The bird represents the cruel way other students have trapped Nothukula in a lonely situation.
C
The bird represents the happiness Nothukula feels living with her loving Auntie Thandi.
D
The bird represents Nothukula’s wish to communicate with the world outside herself.