In "Binding Memories," a Book’s spine serves as an extended metaphor for the Speaker’s support for her sister’s marriage is determination to reach her goals.
In 'Binding Memories' we learn about the roles and importance of women in Maguda, Mozambique. In particular, we learn about their importance as creators and protectors of history. In the book, the author uses the idea of the spine of the book as an extended metaphor to convey the speaker's support for her sister's marriage.
Hence, the correct answer is Option A, determination to reach her goals.
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