According to "Woman Who Helped Hide Anne Frank Dies at 100" by Teri Schultz, Miep Gies helped Anne and her family because

Miep Gies helped hide Anne Frank and her family because she believed it was the right thing to do. She acted out of compassion and a sense of responsibility, not to become a hero or because anyone forced her. Therefore, the correct choice is “it was the right thing to do.”

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