Some business managers are having a chat. What statement as part of their conversation characterizes a movement along the demand curve? O a) "Since our competitors raised their prices, our sales have doubled." O b) "It has been an unusually mild winter; our sales of wool scarves are down from last year." O c) "We decided to cut our prices, and the increase in our sales has been remarkable." O d) "The Green movement has sparked an increase in our sales of biodegradable products