Final answer:
The cornerstones of the daily diet in Central America are beans and corn, which have been staple foods in the region for millennia and provide a balance of essential amino acids.
Step-by-step explanation:
The cornerstones of the daily diet in Central America are beans and corn (option 2). These staple foods have been integral to the diets of Central American cultures for thousands of years. Corn, or maize, was first developed from a native grass called teosinte in what is now Mexico and has become the most important staple in the world, along with beans which were also likely domesticated in Mesoamerica. Together, corn and beans provide a balance of essential amino acids, which is crucial for a nutritionally complete diet. This combination has become a cultural and nutritional foundation in Central American cuisine.