Answer:
b. Gene laughed throughout the movie, but his date didn't laugh once.
Explanation:
because as gene laughed his date didn't 
so no comma needed as that third option nor blank as that first option
 
        
             
        
        
        
Whyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy
-EXPOSEDD
 
        
                    
             
        
        
        
If you had a given sentence:
"James could not eat because he was feeling ill." 
"Because" is acting as a subordinating conjunction. A subordinating conjunctions will combine two independent clauses into one sentence, making it a complex sentence. 
        
             
        
        
        
Answer:
because she understands that society, at the time, valued only a woman's appearance and not her intelligence. She also wants her to be a "fool" so that she doesn't understand this cruel reality.