What does proofreading and having a supervisor approve formal letters ensure?

The choice that highlights the importance of proofreading and having a supervisor approve formal letters is that it ensures the letter properly reflects the image of the organization. This process is crucial because formal correspondence is often a reflection of the professionalism and standards of the organization. By proofreading, errors in grammar, spelling, and punctuation can be corrected, which helps maintain a professional image. Approval from a supervisor further validates the content and ensures it aligns with the organization's policies and tone. This level of scrutiny ultimately supports effective communication and enhances the credibility of the organization in the eyes of recipients.

While sending a letter on time, ensuring it is printed clearly, and including all necessary attachments are important aspects of correspondence, they do not directly relate to the overarching goal of maintaining and projecting the organization's image through clear and professional communication.