challenge: According to the provided context, what are the sources of information for the table about Dir (princely state)?
  
  A. Who's Who in the Dir, Swat, and Chitral Agency, Encyclopædia Britannica, and accounts by local people dating back to the 17th century
  B. Only accounts by local people dating back to the 17th century
  C. Who's Who in the Dir, Swat, and Chitral Agency and Encyclopædia Britannica
  D. Only Encyclopædia Britannica
  Answer: 