In "Binding Memories,” a book’s spine serves as an extended metaphor for the speaker’s A. support for her sister’s marriage.
B. determination to reach her goals.
C. interest in many different subjects.
D. deep enthusiasm for reading.

support for her sister’s marriage.

In the book "Binding Memories," we learn about the roles and the importance of women in Magude, Mozambique. In particular, we learn about their importance as creators and protectors of history. In the book, the author uses the idea of a book spine as an extended metaphor in order to show the speaker's support for her sister's marriage.