World literature usually is the study which explores the different realms of culture and their norms. From these cultures, norms and everday experiencces literature is born and conceived which people write, tell and pass to the next generation. Thus, we discover them by their relativism.
In this world literature, it is about the ancients.
The best answer for this question would be:
Alvarez grappled with the issue of writing a novel about a dangerous subject.
A central idea focuses on the dominant impression of a story in which a general truth of the story is found within it.
The pre in preview means that the students were able to see the movie before it actually came out.