Which of the Following Is True of Immigration in the U.S

Which of the following is true of immigration in the U.S.?

A) The unauthorized immigrant population has significantly plummeted after the Great Recession.
B) The United States is the nation that admits the highest number of immigrants every year.
C) Most of the immigrants that have settled down in the U.S.in recent years have come from Europe.
D) Most of the immigrants who come to the U.S.arrive as refugees who are fleeing political or religious oppression in their own countries.