What can the reader infer about the sister's actions in "Sister and Brother"?
A. The scene that the sister sees makes her decide that sometimes leaving someone is okay.
B. When the sister smiles, it reflects her understanding that finding humor is key. C. The sister's feelings make her decide that taking care of herself is the most important thing to do.
D. When the sister laughs, it reflects her understanding that caring for others is key.​
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