Answer:
B. It introduces a new central idea to focus on.
Explanation:
I say this but I didn't read the passage, so excuse me if I'm wrong. It doesn't seem to be A, sense it isn't contrasting a statement. It really could be C as well, but this seems to be something it would focus on. It could not be D because it is not a concluding sentence, it would leave the passage in an awkward state. This is why I say B.
 
        
                    
             
        
        
        
You should ask yourself: "Who are my readers?"
        
                    
             
        
        
        
I think it would be #1. Compassion.
        
                    
             
        
        
        
Atalanta showed her skill when she hunted a bear.  Though it was killed by Meleager, she was the
one who succeeded in wounding it. She also defeated Hercules’ father Peleus in
a wrestling match.  She is said to be as
strong and athletic as she was beautiful.
 
        
             
        
        
        
The biological purpose of alcoholic fermentation is to provide anaerobic energy to unicellular microorganisms (yeasts) in the absence of oxygen from glucose. In the process, the yeasts obtain energy by dissociating glucose molecules and generate alcohol and co2 as wastes.