A Rolling Stones song goes: "You can't always get what you want." This echoes an important theme from microeconomics. Which of the following statements is the best example of this theme?
A. Consumers must make the best purchasing decisions they can, given their limited incomes.
B. Workers do not have as much leisure as they would like, given their wages and working conditions.
C. Workers in planned economies, such as North Korea, do not have much choice over jobs.
D. Firms in market economies have limited financial resources.