Which choice completes the text so that it conforms to the convention…

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Text

While conducting an interview for her book Latina Authors and Their Muses, editor Mayra Calvani asked Reyna Grande, author of the novel The Distance Between Us, what ________ Grande's response was The House on Mango Street by Sandra Cisneros.

Which choice completes the text so that it conforms to the conventions of Standard English?

her favorite book was?

was her favorite book?

was her favorite book!

her favorite book was.