Which one of the following choices is the best way to get results when dealing with a collection issue?

Sending a personalized letter is the best approach to resolving a collection issue because it demonstrates attention to detail and acknowledges the specific circumstances of the individual recipient. A personalized letter can convey empathy and a willingness to work towards a resolution, which is often more effective than generic communication.

By addressing the recipient by name and including specific details about their account, it creates a sense of urgency and importance, encouraging them to respond. This personal touch can foster a better relationship and prompt cooperation, which is critical in collection scenarios. Unlike a voicemail, email, or generic form letter, a personalized approach can also stand out in the recipient's mind, giving them a reason to act.