Katherine Mansfield's short story 'Miss Brill' is about loneliness. The line suggests that Miss Brill is an important role as she thinks that she is a part of the performance.
Miss Brill is an ironic description story that depicts the pain of loneliness, in one's life and how the lack of companionship and warmth affects the life of a person.
The story portrays many instances that show that Miss Brill was lonely and had no one to talk with. She imagines many things as she is lonely and reflects on her life in her isolation.
Therefore, option a. she is the part of the act shows her role in the story.
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