Final answer:
The least appropriate response to a guest insisting on using an expired coupon is simply pointing out the expiration date without offering any kind of solution or assistance.
Step-by-step explanation:
The statement that is least like how you would respond to a guest trying to use an expired coupon is: d. politely point out the coupon expiration date and explain that the store does not accept expired coupons.
This response does not provide any alternative solutions or show willingness to consider the customer's perspective, whereas the other options offer more constructive ways to address the situation, such as apologizing for the confusion, checking with management about an exception, or helping the customer find an alternative solution.