To apply for naturalization in the United States, a lawful permanent resident typically needs to meet the following residency requirement:
- If they are married to a U.S. citizen, they must have lived in the U.S. for at least 3 years (36 months).
- If they are not married to a U.S. citizen, they must have lived in the U.S. for at least 5 years (60 months).
Given the options provided:
- A lawful permanent resident who has lived in the U.S. for 48 months (4 years) – Eligible if married to a U.S. citizen.
- A lawful permanent resident who has lived in the U.S. for 18 months – Not Eligible.
- A lawful permanent resident who has lived in the U.S. for 60 months (5 years) – Eligible.
- A lawful permanent resident who has lived in the U.S. for 36 months (3 years) – Eligible if married to a U.S. citizen.
So, the individuals who can apply for naturalization are:
- The lawful permanent resident who has lived in the U.S. for 48 months (if married to a U.S. citizen).
- The lawful permanent resident who has lived in the U.S. for 60 months.
- The lawful permanent resident who has lived in the U.S. for 36 months (if married to a U.S. citizen).
Therefore, the answer would depend on the context of their marital status.