A major area of extensive commercial grain farming.

Question -A major area of extensive commercial grain farming.

The correct answer is -The Great Plains of North America is a major area of extensive commercial grain farming. The Great Plains region includes parts of the United States and Canada and is characterized by a flat landscape with fertile soils that are well-suited for growing a variety of crops, including wheat, corn, and soybeans. The region is also known for its large-scale commercial farming operations, with many farms covering thousands of acres and using advanced technology and machinery to maximize crop yields. Some of the major cities in this region include Chicago, Kansas City, and Omaha.