Answer: All of them would be best, but in my opinion health insurance would be best, as the teen would have to go to the doctor for vaccines and check ups. Those are usually not cheap without insurance. In the event that teen gets hurt, enough for surgery, the insurance should cover the cost of that procedure. 
Though you could argue for all of the other ones.
 
        
             
        
        
        
Serious, worried, cynical, regretful, scared
I'm sorry for the lack of details.  I need to go, now.
        
             
        
        
        
If you are looking for a sentence in that paragraph to support the main idea, I think it would be "All it requires is a good pair of sneakers-no cables, stylish outfits, or weights required. The main idea is basically that walking is a good and easy way to begin exercising, and that explains it.
        
                    
             
        
        
        
Atlas held it on his shoulders
        
             
        
        
        
It would be his hunger, thirst, and suffocation in the train car. The other options are internal conflicts because they are occurring inside his head and are emotions or thoughts.