challenge: Where is Duke Ellington Park located?
  
  A. At the intersection of Pennsylvania Avenue NW, 15th Street NW, and New Jersey Avenue NW
  B. At the intersection of Massachusetts Avenue NW, 25th Street NW, and Connecticut Avenue NW
  C. At the intersection of M Street NW, 21st Street NW, and New Hampshire Avenue NW
  D. At the intersection of Wisconsin Avenue NW, 31st Street NW, and MacArthur Boulevard NW
  Answer: 