Step-by-step explanation:
B. Slang or filler words.
In formal writing, it is important to use clear, concise language that conveys your ideas and arguments effectively. Using slang, colloquialisms, or filler words can detract from the professional tone and clarity of your writing. Additionally, it is important to use a formal, objective voice in formal writing, and avoid using a personal voice that includes opinions or subjective language.
Dates and signatures can be appropriate in some formal writing, such as business letters or legal documents, while complete sentences are essential for clear communication. However, using slang or filler words can be a significant barrier to effective communication in formal writing.