To apply for naturalization in the United States, a lawful permanent resident typically must have lived in the U.S. for at least 5 years (60 months). There are some exemptions, such as for spouses of U.S. citizens, who may be eligible to apply after 3 years (36 months).
Based on the options provided, the only individual who meets the standard requirement for naturalization is:
- a lawful permanent resident who has lived in the U.S. for 60 months.
The other durations (18 months, 36 months, and 48 months) are not sufficient for most lawful permanent residents to apply for naturalization (except in specific circumstances, such as the spousal exception).