Which statement best characterizes the stylistic difference between Ribera del Duero and Rioja red wines?

Which statement best characterizes the stylistic difference between Ribera del Duero and Rioja red wines?

• A. Both rely on Tempranillo and are typically light in color
• B. Rioja is always lighter and more tannic than Ribera del Duero
• C. Ribera del Duero is often blended with white varieties
• D. Ribera del Duero tends to be darker, more tannic with higher alcohol, while Rioja often blends Tempranillo with Garnacha or Graciano and ages in oak longer

Answer: (D)