How does the choice of base year affect the comparability of real GDP data over time?

• A. It does not affect comparability as real GDP is always consistent regardless of the base year.
• B. It affects comparability because the base year determines the population size used in calculations.
• C. It affects comparability because the base year is used to calculate nominal GDP.
• D. It affects the comparability because different base years can lead to different interpretations of economic growth.

Answer: (D)