To help diminish disposable cup usage and waste, a coffee shop is experimenting with providing consumers their coffee in a mug they "check out." Sometime later, consumers either return the mug or they are charged $15. What does this example show? a. Ideas come from giving information to the sales force. b. Ideas do not come from customers. c. Ideas come from making decisions for frontline workers. d. Ideas can come from observing social (or cultural or economic) trends