the passage it trying to create a welcoming image to the readers mind. its trying to make you see how similar and beneficial both are and that creates a sort of "welcoming" image. It creates a goal of acceptance at first... then the second they start to talk about censorship it becomes negative and unwanting. it tries to turn you away from the idea of it, it explains how useful and unnecessary it is.
therefore, the most likely option would indeed be A- to persuade readers to oppose the censorship of literature