The answer will be A. Harmful it says it in the definition.
Self-fulfilling prophecies- life is what you make of it. If you say you are going to do a bad job, you are going to. If you can't even believe you're trying hard, how are you going to act your work out? There isn't a point in working hard if you think everything you do is bad, chances are, you are going to do bad.
Sorry if this isn't good enough!!
Culture, or the beliefs of a group of people.
