I would say this is a complex sentence. Because it has one independent clause(their more aggressive style did not pay of.) and two dependent clauses.
The correct answer is <span>A) Everyday Life and Common Subjects
The realist era was a period of time in the 19th century where the writers wanted to depict everyday common life without many extreme situations or anything adventurous or unusual. They wrote like this because they wanted to present real life and common problems in real life and to help people understand what is bad about the way their lives were being governed.</span>
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Answer:
from my side the answer is the B one