Immigration Policy in Western European Countries Is Best Described as Follows

Immigration policy in Western European countries is best described as follows:

A) immigration is strictly banned, and the only immigration that occurs is unauthorized.
B) guest workers were permitted in the past, but today few immigrants are allowed in.
C) immigration among members of the European Union is unrestricted, but immigration from outside the union is tightly restricted.
D) Western Europe is a source of immigrants, not a destination, and therefore it has no explicit immigration policies.