D, the personnel manager, it says at the top of the letter and Lilly is trying to set up an interview with them. Hope this helps :)
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I would say prefixes but in not 100 percent sure!
My only real complaint about Susan K. Harris's The Courtship of Olivia Langdon and Mark Twain is that it is mistitled: the present title trivializes the accomplishments of this book. A more appropriate title would be something like Negotiating Differences in Victorian America: Olivia Langdon, Sam Clemens, and Reading Relationships or The Rhetoric of Love: How Olivia Langdon and Sam Clemens Became Mr. and Mrs. Clemens. I don't know. It just seems that what the author has accomplished in this small volume deserves a better title, at least one with a colon.