To apply for naturalization in the U.S., a lawful permanent resident typically must have lived in the country for at least 5 years (60 months) or 3 years (36 months) if they are married to a U.S. citizen.
Given the options you've provided, the lawful permanent resident who has lived in the U.S. for 60 months qualifies for naturalization. The individuals who have lived in the U.S. for 36 months may also qualify if they meet the requirement of being married to a U.S. citizen.
So, the people who can apply for naturalization are:
- A lawful permanent resident who has lived in the U.S. for 60 months.
- A lawful permanent resident who has lived in the U.S. for 36 months, provided they are married to a U.S. citizen.
The lawful permanent residents who have lived in the U.S. for 18 months do not qualify.