Where did immigrants in cities usually live
A single~family homes
B homesteads
C camps
D ethnic enclaves

Immigrants in cities usually live in ethnic enclaves.

Explanation:

Ethnic enclaves were mainly created by the immigrants for a purpose, they mainly tried to preserve the cultural identities. The neighborhoods that was mainly created by the immigrants provided huge support to their language, specially the new people who wanted to speak the native language or the people who were learning English still.

Mainly the chain migration helped in creation of ethnic enclaves, so that people of that culture can migrate to that spot where other people are staying.