The correct answer is B. Matthew Jamison.
In the given citations, the book "Roman Emperors Through History" by Matthew Jamison is the only one that was published in the 18th century. The publication year of a book is typically listed in the citation along with the author's name, the title of the book, and the publisher. In this case, the publication year for Jamison's book is 1721, which means it was published in the 18th century. The other books in the citations were published in different centuries, so they are not relevant to the question.