What was one of the two main beliefs of the Incas?

The practice of human sacrifice was indeed one of the significant beliefs within Inca society, reflecting their deep connection between spirituality and the forces of nature. The Incas believed that human offerings were a way to appease their gods, particularly in times of crisis or important rituals. For instance, the sacrifice of a child, known as capac hucha, was often conducted during times of drought or famine, believed to ensure agricultural fertility or to honor deities such as Inti, the sun god. This belief was rooted in the Inca's view of reciprocity in their relationship with the divine, where they felt a need to give offerings to maintain balance and favor.

In contrast, the other options represent practices or beliefs that were part of Inca culture but not as central as human sacrifice. Animal sacrifice, while practiced, often served different purposes such as offerings for specific festivals or celebrations, and ritual dances were performed to honor the deities but did not involve the same level of sacrificial commitment as human offerings. Similarly, the offering of food was indeed an important element of rituals, but it did not carry the same weight or significance as the practice of human sacrifice in their religious framework.