Question

Select all of the ways by which dialects are affected.

Education
Occupation
Communities
Regions

Answer 1

communities and regions

Answer 2

Communities and regions mostly affect dialects, but education is also very important because that's where you learn it.  I would say if one is not to be chosen, the out-one would be occupation, because careers don't help, it is an extension of your community and region.  Good luck! :)