I think it is A. Genocide because the remaining answers were in the 20th century and there was a lot of hate towards Muslims in the 21st century due to 9/11. hope this helps!
The crime of genocide is an international issue that is currently facing the world and the United States in the 21st century.
It involves the gruesome act of killing large number of people from a group with the aim of destroying such group.
This act is still an international issue that is currently facing the world and the United States in the 21st century.
Therefore, the Option A is correct.
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