What were the key features of Song economic transformation, especially in urbanization and commerce?

What were the key features of Song economic transformation, especially in urbanization and commerce?

• A. Rural stagnation, decline of commerce, and de-emphasis on money.
• B. Rapid urban growth, a thriving merchant class, widespread markets, and adoption of paper money and state monetization.
• C. Increase in feudal estates, decreased urban centers, bartering system.
• D. Isolationist economy with heavy taxation on merchants.

Answer: (B)