Among the New Immigrant Groups in the United States

Among the new immigrant groups in the United States,

A) immigrants from Southeast Asia (especially Vietnam) are one of the better-off immigrant groups.
B) the largest number are from the Middle East.
C) the largest number come from Mexico.
D) none are from the former Soviet Union, since the U.S. has consistently denied entry to refugees from that country.
E) Vietnamese constitute the largest number of immigrants.