challenge: What was the main purpose of the two-volume set published by Dr. Gurmit Singh Aulakh's organization (ISO) in 2013?
  
  A. To provide a historical account of the Indian independence movement
  B. To document human rights abuses in the United States
  C. To compile U.S. Congress statements on the Sikhs' movement for political and human rights in India
  D. To promote Sikh culture and traditions globally
  Answer: 