Which of the following best describes the tone of a business letter?

The tone of a business letter is best described as professional and formal because it reflects the nature of communication in a business environment. This tone is essential as it establishes credibility and respect among the parties involved. A professional and formal tone helps to convey the message clearly and effectively, ensuring that the correspondence is taken seriously and is appropriate for the context.

In contrast, a casual and informal tone may not be suitable for a business setting, as it could lead to misunderstandings or a lack of seriousness about the subject matter. A direct and confrontational tone is also inappropriate for business letters, as it can create conflict and is often viewed as unprofessional. Lastly, a friendly and personal tone, while it can foster positive relationships, typically lacks the necessary formality required in most business communications. Therefore, maintaining a professional and formal tone is crucial for effective business correspondence.