An adverb ends in -ly, but not always
        
                    
             
        
        
        
If you were assigned a three-page research paper, which of these topics would be too broad is option D:  Plumbing Trade Schools in the Northeast.
<h3>What is in a research paper?</h3>
A research paper is just an essay that has been broadened to be made up of a personal or your own analysis, judgment, as well as justification. 
When writing an essay, a person need to draw on all of your personal knowledge and understanding of the subject.
Therefore, based on the above, If you were assigned a three-page research paper, which of these topics would be too broad is option D:  Plumbing Trade Schools in the Northeast because the Northeast  is too broad.
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B. Their
There is where something is, and They're is they are