Imagine the offline moment in your life， suppose you go for groceries in a supermarket， buy a snack in street shops， eat at some restaurants， go to watch a movie， or take a subway， you just scan their（）on their wall or at the cashier， the mobile pay page would automatically pop up created by those mobile payment apps.

A.QR code

B.money

C.card

D.bill

正确答案：QR code