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

Explanation:

The historical detail that can best help clarify a reader's understanding of the information in the excerpt is Immigrant factory workers who spoke the same language were separated from each other at work.

Explanation:

The historic detail of separating workers that spoke the same language, clearly explains the general idea of the excerpt sin Yiddish is spoken by Jewish people, Italian by Italian people, English by several groups from different countries, along with their language differences they may have beliefs and other kinds of differences that could generate a conflict.

i cannot see any of the options                                                                        

a. they have shared matter.