What is the best definition of an undocumented worker?
A. an immigrant who applies for entry and is admitted
B. an immigrant who lives and works in a country illegally
C. an immigrant who comes seeking educational opportunities
D. an immigrant who leaves an area to escape war or oppression
"Undocumented" means unregistered or unaccounted for. An immigrant working in a country without being registered as a citizen represents this scenario.
