California accounts for what percentage of all US wine production?

• A. 50%
• B. 70%
• C. 90%
• D. 80%

Answer: (C)

This question is about how wine production is distributed across the United States, focusing on California’s dominant role. California has the climate, vast vineyard acreage, and well-established wine infrastructure that enable very large-scale production. Because of these advantages, the state accounts for roughly nine-tenths of all U.S. wine production, meaning about 90%. The remaining states together contribute a much smaller share, even though they produce high-quality wines. So the best answer reflects California’s dominant share, around 90%.