I think the difference would be that you were probably going to come to the store anyway for whatever reason. So option B is really, "A driver starts at Walmar

I think the difference would be that you were probably going to come to the store anyway for whatever reason. So option B is really, "A driver starts at Walmart, picks up three people's shopping, delivers it all, returns to Walmart. You also drive to Walmart, pick up your shopping, and drive home."