What factor contributed to the narrator being asked to write about Stein's new book?

The narrator was asked to write about Stein's new book primarily because of their long-standing friendship with her. This personal connection likely provided the narrator with unique insights and a sense of trust regarding the material. Friendships in the literary world can enable deeper understanding and appreciation of an author's work, which would be beneficial in crafting an informed and nuanced piece about Stein's book. Such a relationship would also give the narrator more access to Stein's thoughts and intentions behind the work, making the analysis richer and more compelling. This situational context is often considered in literary critique and can significantly influence the perspective offered in any writing about the author's work.