The correct answer is option C - People from other countries.
The word 'alien' derives from the Latin alienus meaning stranger or foreign. It refers to a resident who is not a citizen of a given country.
Regarding the United States, under federal law in 1940, all aliens had to register.
Aliens who enter legally in the United States may be certified and granted 'green cards' which give them certain rights such as employment. He may also evoke the habeas corpus and make use of the guarantees of the Bill of Rights.
