I am not fully sure that this is correct, but I believe it is yellow journalism. Forgive me if I'm wrong, though.
I believe the correct answer is D
The answer is legal immigrant. There are many ways on which a person can become a legal immigran some of which are: job sponsorship, marriage, asylum seekers and so on. This is a very controversal topic in the US under Trump’s administration. Usually a legal immigrant is a holder of a ‘green card’ document.
The correct answer is A. a primary group.
Primary group refers to individuals following other people's example when doing something. Here, Mary started using the language of that particular group and dressing like them. Thus, they represent her primary group in her life.