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I believe the correct answer from the choices listed above is option B. The option that would best make the text suitable for a slide in a presentation would be the  inclusion of very detailed statistics and examples. 
Hope this answers the question. Have a nice day.
        
                    
             
        
        
        
Coordinating conjunctions bring two clauses (subject + verb + object) together. When joining two ideas, the comma is used.
Brutus claims to be an honorable man, but he stabbed Caesar.
Contrast conjunctions introduce a contradiction with what is said before (Brutus is honorable or honest, but he is a killer).