challenge: When did the postal stop in Elysville, Maryland, operate?
  
  A. November 7, 1811 - September 9, 1847
  B. February 22, 1844 - March 3, 1854
  C. February 22, 1834 - February 3, 1854
  D. January 15, 1822 - April 5, 1862
  Answer: 