The correct option is C. The Mayans relied on calendars to plan activities, but the Incas relied on divination.
The Mayans are known for using a Calendar to plan and organize activities. The Mayan Calendar is divided into "the Long Count", "the Tzolkin" and "the Haab". Each one corresponds to a cycle, which means that there's a certain number of days to pass before the other one begins.
On the other hand, the Incas would rely on Divination to look for knowledge of the future. They relied on this practice seeking to diagnose illnesses, investigate crimes, decide the sacrifices that were to be made to gods, inform people of social events, and the like.
Incas used to consult oracles, observe the movements of a spider and the coca leaves and drink ayahuasca (which is an hallucinogen tea) in order to have the answers they were seeking.
