Answer:
I would say that the word that best describes the style of these lines from Main Street, by Sinclair Lewis, is the third one: analytical.
Step-by-step explanation:
In this excerpt, the author explains the methods of the Blodgett College. The speaker analizes with reasoning thoughts the characteristics of this place, tells the audience that it is "a bulwark of sound religion", and that is "still combating the recent heresies of Voltaire, Darwin, and Robert Ingersoll". The author gives details about the Blodgett and interprets them in this paragraph, that is why I chose analytical as the word to describe it.