You notice a group of minors outside of your liquor store and see them speaking with an adult who is about to enter your store. They give the adult customer money. The customer buys an expensive bottle of wine and two large, cheap bottles of cider. You suspect that the cider is for the minors outside. What should you do$?$

Refuse the sale because you suspect the customer is bootlegging

Allow the sale and watch what happens outside

Go outside and tell the minors to go away

Allow the sale because the customer is of legal age