Answer:
B). Slang displays a tone that is too casual.
Step-by-step explanation:
Words influence the efficacy of a message and thus, it has to appropriate to the surroundings. As per the question, using slang in a business setting is considered inappropriate as it proposes a tone that is 'too casual' that makes the conversation sound informal and 'unprofessional'. A business setting rather requires a formal and gentle language that displays respect for the recipient.
Excessively informal or casual language may affect business relationships and reflect the lack of respect. Communication is crucial in any business. Thus, it should avoid using slang and instead use 'formal and ethical language' which reflects politeness and a sense of respect and responsibility. Therefore, option B is the correct answer.