The answer is colon. Hope this helps!!
        
                    
             
        
        
        
D: A list of important words in the text.
It's like a mini-dictionary if you know what I mean.
(First answer! :D)
        
             
        
        
        
Answer:
The Holocaust of WWII resulted in millions of deaths of Jewish people and years of oppression for Jews.
Explanation:
It was caused by Adolf Hitler's pure hatred of the Jewish people, and fun fact, when he was a boy, he wanted to be a priest. Sorry, I know that's totally unrelated to the question.