Answer: The sea (A)
Explanation: Hope this helps have a great day bye. ;)
 
        
                    
             
        
        
        
Im pretty sure is the last one
        
             
        
        
        
Answer: I think the second line is correct it you put a apostrophe in the first and before Simpson.
Explanation: The third line is also correct it is a I;I compound sentence. But the first line has some mistakes.
 
        
             
        
        
        
Building a fire is an act of technical skill and technology, and fire in literature has also often been used as a symbol of knowledge. The building of a fire thus symbolizes life in the story, but also life through human knowledge, skill, and technology.
        
                    
             
        
        
        
Answer:
c. Because Cheryl is a farmer, she has very strong opinions about GMOs, but she hasn't shared them with me.
Explanation:
A compound-complex sentence is a sentence which is made up of at least two independent clauses, a predicate, verb, and one or more dependent clauses and is separated by a comma or semicolon. 
Therefore, from the given answer choices, the choice that is a compound-complex sentence is option C.
This is because, the sentence has more than one independent clause and is separated by commas.