Help the barista gently crush a customer's dream of having a whole blueberry muffin blended into their iced coffee. Choose the best word to complete the polite refusal.

"I'd really like to make that muffin-ccino for you. _____, it's against our store's health and safety rules."

The correct answer is Unfortunately.

Unfortunately is an excellent adverb for politely delivering disappointing news. It softens the blow by showing empathy, making it sound like you wish things were different but the situation is simply out of your control.