Adverb for sure as mighty often refers to being strong and fierce and can only really be used to describe a movement like a mighty punch BUT it can be an adjective as mighty may be used as a mighty man etc.
He was so keen on making illusions with his life no one knew who he was the whole party scene was to partake of the fact to kinda prove that people wanted to fit in and party no one even knew who Gatsby was when in reality he was just one of them and so the whole party and empty conversations were an illusion to show gatsbys life was an illusion
1. complex sentence (dependent clause, independent clause)
2. complex sentence (dependent clause, independent clause)
3. compound sentence (two independent clauses)
4. compound sentence (two independent clauses)
5. complex sentence (dependent clause, independent clause)
Remember that compound sentences have 2 or more independent clauses (complete thoughts) while complex sentences have at least 1 indepedent clause and 1 dependent (incomplete thought)
The answer is C, that should help.