I don’t understand what your asking for. Can u put it in English
Your answer will be C) Workplace cliques can cause horizontal disharmony (just like how cliques would form in say a high school!)
We can eliminate the others because A. Office friendships would actually lead to more socializing, B. Ethnic similarities are usually not a big factor in choosing to socialize or be friends with a person, and D) This is not impossible, just usually not encouraged
Google translate helps with translating things.
A lot of schools do have English classes but it is not a requirement.
Buy a teacher and learn from her c c c c c c c c c