Look at the graphic. A map of the United States showing the Great Plains in the middle of the country, Eastern Cities on the East Coast, and Midwestern Cities in between. An arrow between the Great Plains and Midwestern Cities pointing right is labeled Cattle. An arrow between the Midwestern Cities and Eastern Cities pointing right is labeled Meat.

According to this graphic, what was the role of midwestern cities in the meatpacking industry?
They were a major source of cattle for the meatpacking industry.
They processed meat to be sold in the Great Plains.
They processed meat to be sold in eastern cities.
They served as a stopping point for farmers bringing their cattle to eastern cities.