Hey, this is Mr. Mungall, your teacher--and since I created this content and own the copyright, I suggest you call me so I can help you with the content directly.
 
        
             
        
        
        
The answer should be the first one and the fourth one
        
                    
             
        
        
        
It was almost like traveling back in time
        
             
        
        
        
Hello. You forgot to show the answer options. The options are:
What are three landmarks in Washington, D.C.?
Where is Washington, D.C.?
How big is Washington, D.C.?
What does D.C. mean?
How was the White House constructed?
Answer:
What are three landmarks in Washington, D.C.?
Explanation:
Open-ended research question are questions that allow for free answers, that is, the answers can be answered with something other than "yes" and "no" leaving the person who is going to answer free to use the words they want. While all of the above can be considered an open-ended research question, only the first option encompasses the three items requested in the question, whether directly such as "Washington, D.C." and "landmarks," as indirectly, as "the White House."