The difference between humans and animals is that animals are not physically equipped to do the things that humans do because they do not have thumbs. in the book is says that there could never be equality among animals and humans because of the need to be in charge and if humans or animals are in charge the other side will get bad treatment whether it is the humans or animals. in the book it shows how the animals tried to be better than the humans but ended up doing the same thing as the humans due to power and the need to control there surroundings.  
        
             
        
        
        
The ways in which the characters respond to a specific situations frequently reveal the authors' meaning.
        
             
        
        
        
It can cause cancer! Good luck god bless!
        
                    
             
        
        
        
Im sorry for the false answer last time. the real answer is (television : show)
        
                    
             
        
        
        
Answer:
A or C I'd pick A myself.
Explanation:
Anything with a comma in front of instead is simply not correct. The sentence is too long and the change too abrupt to be handed with a comma. So B and D leave a little bit to be desired.
I don't think C is correct, but it is just marginally not so. If I saw it in a student paper, I'd probably ignore it. I don't think you need the comma after instead. I would pick a myself, but that does not mean I'm correct. 
Don't be a bit surprised to see the answer is C. I think the comma after instead is too much, but that is a matter of opinion.  
Instead is an adverb. Most of the time you need not emphasize adverbs. It's a very hard call.