challenge: What is the historical significance of the Bibi Mariam Cannon in Dhaka, Bangladesh?
  
  A. It is a modern artillery piece used by the Bangladeshi military.
  B. It was a gift from a European country to Bangladesh in the 20th century.
  C. It was used in a significant battle during the 19th century.
  D. It dates back to the 17th century and is displayed at the Dhaka Gate.
  Answer: 