Books about architectural works, unless they are not intended for a general audience, ought to include discussions of both the utility and the aesthetic appeal of each of the buildings they consider. If they do not, they are flawed. Morton' s book on Italian Baroque palaces describes these palaces' functional aspects, but fails to mention that the main hall of a palace he discusses at length has a ceiling that is one of the truly breathtaking masterpieces of Western art. If the statements above are true, it would be necessary to establish which one of the following in order to conclude that Morton's book is flawed? ["Morton's description of the palaces' utility is inaccurate.", "The passage discussing the palace plays a very important role in helping to establish the overall argument of Morton's book.", "Morton's book is intended for a general audience.", "The palace discussed at length is one of the most aesthetically important of those treated in Morton's book."]