To apply for naturalization in the United States, a lawful permanent resident (Green Card holder) generally needs to have lived in the U.S. for at least 5 years (60 months) or 3 years (36 months) if they are married to a U.S. citizen.
Based on the options provided:
- A lawful permanent resident who has lived in the U.S. for 48 months: Not eligible (requires 60 months or 36 months if married to a U.S. citizen).
- A lawful permanent resident who has lived in the U.S. for 36 months: Eligible (if married to a U.S. citizen).
- A lawful permanent resident who has lived in the U.S. for 60 months: Eligible (meets the 5-year requirement).
- A lawful permanent resident who has lived in the U.S. for 18 months: Not eligible (does not meet the requirement).
Thus, the ones who can apply for naturalization are:
- A lawful permanent resident who has lived in the U.S. for 36 months (if married to a U.S. citizen)
- A lawful permanent resident who has lived in the U.S. for 60 months.