B. A teacher travels each year to visit family in South Africa. I mean, honestly, who cares? That's nice of her, but it won't really get the point across if Greg wants people to not only hear his speech but live it as well.
I hope this helps :) 
        
             
        
        
        
The computers are old dinosaurs
        
             
        
        
        
A would be the sentence with a confusing antecedent, because the "he" could have been referring to "Uncle Arthur" or "Benjamin."
        
             
        
        
        
Answer:
i'd say it's A. It makes the most sense, if not that then it would be C but I'm pretty sure it's A.
Explanation: