Umm I’m sorry I don’t understand what ur saying.
Answer:
Whats the question? Ill just go with B?
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
It is like a party leader or a leader of sum
If you know anyone who speaks tamil, practice with them! Also, I find watching and listening to songs and movies helps with pronunciation.