Which revision of this sentence uses commas correctly?A)Looking fearfully over his shoulder, Francis slowly opened the book that he had been expressly forbidden to read by his English teacher. B)Looking fearfully over his shoulder, Francis slowly opened the book that he had been expressly forbidden to read, by his English teacher. C)Looking fearfully over his shoulder, Francis slowly opened, the book that he had been expressly forbidden to read by his English teacher. D) looking fearfully over his shoulder, Francis slowly opened, the book that he had been expressly forbidden to read, by his English teacher