Final answer:
An unacceptable question or statement would be anything accusatory or blaming towards the customer during a return, as these can lead to a negative experience and are not in line with good customer service practices.
Step-by-step explanation:
An unacceptable statement when helping a customer return a jacket bought about a month ago would be any question or statement that is accusatory or blames the customer for the return. For instance, asking "Why didn't you notice the issue earlier?" or saying "You must have used it improperly to want to return it now."
These types of statements can make the customer feel at fault and are not conducive to positive customer service experiences. It is important to maintain a professional, polite, and customer-centric approach when handling returns or exchanges to ensure customer satisfaction and uphold the company's service standards.