Twenty-four halls were rented all over the Lower East Side. Each shop was to have its own meeting room, with separate rooms for Yiddish, Italian, and English groups wherever possible. Which historical detail can best help clarify a reader’s understanding of the information in the excerpt?

Immigrant factory workers who spoke the same language were separated from each other at work.
Immigrant factory workers who spoke the same language were known to talk too much at work.
Immigrant factory workers had to pay rent for their chairs and the supplies they needed at work.
Immigrant factory workers were crowded into unsafe buildings with locked doors and fire escapes.