Answer to Question 1
Since stereo equipment is a complementary good to CDs, a decrease in the price of stereo equipment causes the demand for CDs to increase. The increase in labor costs causes the supply of CDs to decrease. The price of CDs will increase, but the quantity sold in the market could increase, decrease, or remain the same. The quantity effect depends on how much demand increased relative to how much supply decreased.
Answer to Question 2
D