Which of the following is true of supply chain management systems?

A. They are shorter than the average channel of distribution.
B. Virtually any company that participates has benefited from lower costs.
C. They can help to make a company more responsive to market changes but at a higher cost.
D. They create a more efficient method of distribution by widening the channel to include suppliers.

Supply chains management is a chain that involves all the activities of the firms. From procuring of supplies to value adding and manufacturing to delivering the to consumers. Thus by incorporating each stage of business and firms involved they make the overall distribution more responsive and efficient by including all partner companies and suppliers. Thus the create efficiency by widening the channel.

All the other options are consequential which may or may not always be true.

Hope that helps.