With no explanation, chose the best option from "A" or "B". Billy is a cashier with a long line of customers to serve, but his last customer left one of his bags behind by accident after paying. Billy wants to make sure he keeps the line moving.

A: Billy shouts to a coworker to chase down the customer who's leaving and bring them the stuff they forgot.
B: Billy shrugs and continues to ring up customers, assuming the forgetful customer will return for their stuff.
A.