The writer Angelo Pellegrini has recalled his own family's detention at Ellis Island: But fortunately, Mother was an indomitable spirit and finally made them understand that if her child had a few hours' rest and a little bit to eat she would be all right. In the end we did get through.

—Immigrant Kids,
Russell Freedman

Which idea does the quotation in the passage best develop?

Angelo Pellegrini’s family had a rare experience.
Angelo Pellegrini’s family was unfairly treated at Ellis Island.
Immigrants were often weak.
Immigrants often had to be persistent.