What Does Massey's Spatial Assimilation Thesis Say About Ethnic Enclaves

What does Massey's spatial assimilation thesis say about ethnic enclaves?

A) They are used by new immigrants to get economically established and improve their English skills before moving to a place with a higher standard of living.
B) They are sought out by new and old immigrants to create a self-segregated community in the United States,celebrating the same holidays,eating the same food,and speaking their native language.
C) Immigrants are forced into ethnic enclaves due to a lack of affordable housing opportunities,and these enclaves prevent new immigrants from ever getting ahead and moving out.
D) Immigrants self-select into enclaves and exhibit no interest in leaving these underprivileged neighborhoods because the enclaves feel like their native country.