This German-coined term refers to workers who work in a foreign country, as long as there's work available, but who would eventually return to their respective homelands.

A. Resident alien

B. Guest worker

C. Immigrant

D. Temporary worker

Option a resident alien

resident it means coming from other place, not permanent, stranger or a foreigner

classification:

1) legal alien - tourists, legal permanent workers, student-visa, and guest workers

2) nonresident alien-tourist, on business, entertainers, sports people, under medical treatment

3) resident alien-temporary resident

4) enemy alien-national enemy

5) illegal alien - unlawfully authorized, overstayed and cross along the border line