Why is using slang inappropriate in a business setting?
slang is acceptable if you are extremely familiar with your audience.
slang displays a tone that is too casual.
slang is an example ofpathosand considered unprofessional.
none of the above.

The correct answer is "Slang displays a tone that is too casual"

Slang speak is highly informal, sometimes even offensive. One should never use slang in a business setting because business deals should be kept highly informal and professional. Slang shouldn't be used under any circumstance as it may insult the people with whom we are talking by making it seem that we don't appreciate them or their business endeavors.