How did ethnic enclaves and organizations like the six companies assist foreign migrants in becoming "american"?

The correct answer is letter "C. They helped them ±nd work and housing and provided educational opportunities suchas learning English."

There exists the same question with the following choices:
A. They bought tenement buildings and intentionally rented rooms to people of diFerentbackgrounds
B. They created social clubs for people of diFerent backgrounds to mingle and practicespeaking English.
C. They helped them and work and housing and provided educational opportunities suchas learning English.
D. They paid for the passage of migrants to enter the nation's ports in order to increasetheir own ethnic numbers