The Andean mountain agriculture supported the production of meat, grains, and potatoes. This region was known for its cultivation of potatoes, which were a staple crop. Additionally, grains such as quinoa and maize were grown, providing a source of carbohydrates. Livestock farming, including the rearing of llamas and alpacas, provided meat and other animal products. Therefore, the correct answer is "Meat, grains, and potatoes."