Answer:
The third sentence is correct.
Explanation:
The other three do not use the words correctly.
The last sentence has an error in comma usage
I believe the answer is C, though it could be B. I'd say go with C because 'because' is separating two clauses.
Given that the plot is set in the nineteenth century, and that it is pretty realistic, I can safely conclude that the correct answer is 'realism'. The other answers don't fit, theme-wise, and the era they originated in: classicism and romanticism were before the 19th c., and postmodernism started in the 20th.
