The answer to the question is letter "B. informal". This is the level of diction which is conversational. This includes documents, personal letters, emails, and others that are aimed to converse and entertain. Further, this also sometimes includes "slang" language.
I need the sentences because I can't help you without them I'm very good with English.
The correct answer is option D (a belief about an entire group of people based on one’s general perceptions). Stereotype is defined, in social psychology, as<span> any thought or belief widely adopted about specific types of individuals intended to represent the </span>entire group<span> of those individuals.</span>
B) Someone’s face ur welcome