I believe the answer would be Bill Gates. An appositive is a noun that renames a noun right beside it. In this case, "Bill Gates" is renaming "One of the richest men in the world."
 
        
             
        
        
        
Answer:
Implication
Explanation:
the conclusion that can be drawn from something although it is not explicitly stated.
"the implication is that no one person at the bank is responsible"
 
        
             
        
        
        
I say its...
 Traveling toward the west, the caravan made slow but steady progress.
Hope it helped :)