Final answer:
The inappropriate sentence for a collection message is 'You are obviously trying to avoid paying us what you owe' due to its confrontational nature. Collection communications should instead be respectful and constructive.
Step-by-step explanation:
The sentence that is not appropriate for a collection message is b) You are obviously trying to avoid paying us what you owe. This type of messaging can come off as accusatory or confrontational, which is not effective for resolving payment issues and may further strain the customer relationship. Instead, collection messages should be professional, courteous, and aim to assist the customer in finding a way to meet their payment obligations.
It's important to maintain a tone that preserves the customer's dignity and encourages them to act without feeling attacked. Sentences like a) A duplicate copy of your credit charges is enclosed, c) Your credit reputation is a valuable asset, and d) If you haven't sent us your payment, please do so today are examples of more appropriate communication that focuses on the issue at hand in a positive manner.