Refer to the Four Graphs Above

Refer to the four graphs above. Select the graph above that best shows the changes in demand and supply in the market specified in the following situation: In the market for music CDs sold in stores, if more consumers switch to music-downloads from the Internet, and the cost of making music CDs decreases because of technological improvement in production.

A) Graph A
B) Graph B
C) Graph C
D) Graph D