Many Countries of the World Have Experienced Substantial Inflows or Outflows

Many countries of the world have experienced substantial inflows or outflows of immigrants over the past 50 years, including:

A) the involuntary movement of about 7 million Muslims from India to Pakistan.
B) the 6 million Japanese who moved back to Japan from China (Manchuria) , Korea, and Formosa.
C) the involuntary movement of about 7 million Hindus from Pakistan to India.
D) All of the above.
E) None of the above.