The correct answer is: B. Supply curve of compact disc players to shift rightward faster than the demand curve for compact disc players shifted rightward.
The price of compact disc players fell over the past decade due to the combination of improving technology and rising incomes. Improving technology has made it cheaper to produce compact disc players, while rising incomes have made people more willing to buy them. This has caused the supply curve of compact disc players to shift rightward, as more firms are willing to produce them at a given price. The demand curve for compact disc players has also shifted rightward, as more people are willing to buy them at a given price. However, the supply curve has shifted rightward faster than the demand curve, which has caused the price of compact disc players to fall.
Option A is incorrect because the demand curve for compact disc players has shifted rightward, not leftward. Option C is incorrect because both the demand curve and the supply curve have shifted rightward, not leftward. Option D is incorrect because the supply curve has shifted rightward, not leftward.