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：A