Answer: I do not know if this is a multiple-choice question or not, but I would contend that the right answer is: the first book to have been printed in the English language.
Explanation: Just to elaborate a little bit on the answer, it can be added that this printed book, which was printed in either Bruges or Ghent in 1473, is a compilation (recueil in modern French) of stories about the Troyan Wars that were originally written in French by the 15th-century French author Raoul Lefèvre. The author of the translation and of the printing process was an Englishman named William Caxton (ca. 1415—1492), who was the first person that used the printing press in England—he printed the book in Belgium, but a few years later he took his printing press to England.