C is the correct answer for this question. Guilt can hide what people want to do and prevent them from doing it ever again.
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
Answer:
C. Establishment of the American School for the Deaf
Explanation:
This caused many people to realize that the deaf can learn just as well as anyone else.