Final answer:
Paula is an immigrant because she moved from Poland to New York City to live with her husband.
Step-by-step explanation:
Paula is considered an immigrant because she moved from Poland to New York City and established a household there. An immigrant is a person who moves from their place of origin to live in a new country. In this case, Paula moved to New York City when she married her husband twenty years ago. Her decision to move was not forced by war, persecution, or natural disaster, which would make her a refugee, nor is she in exile or merely moving without establishing a household, which is the case for migrants. Therefore, the correct answer is d) immigrant.