Which of the following is a production factor affecting demand for wine?

• A. government policy to reduce consumption
• B. currency exchange fluctuations
• C. area under vine
• D. consumer health trends

Answer: (C)

This question tests how a factor tied to production can influence demand in the wine market. Production factors are linked to how much wine can be made, so they affect supply. The area under vine directly measures the land available for grape cultivation; more land means producers can potentially raise output, shifting supply to the right. When supply rises and prices fall, it often leads to a larger quantity demanded, even if buyers’ preferences haven’t changed. So area under vine is the production-related factor among the options that can affect demand indirectly through its impact on supply.

The other factors operate on demand or broader economic forces rather than production capacity: policy aimed at reducing consumption targets demand, currency fluctuations influence price and demand across markets, and consumer health trends affect preferences.