Final answer:
Cusco is most closely related to Templo Mayor Tenochtitlan, as both served as central hubs in their respective empires (Inca and Aztec) and had similar cultural significance.
Step-by-step explanation:
The city of Cusco, as described in the question, representing a tinkuay or convergence, is most closely related to the option 4) Templo Mayor Tenochtitlan. This is because Cusco was known for its unique architecture and significance as the heart of the Inca Empire, similar to how Tenochtitlan served as the central hub of the Aztec civilization with the Templo Mayor at its center. The other options like Chavín de Huantar, Chichén Itzá, and the Pyramid of Kukulcán, while outstanding examples of their respective cultures, do not as closely mirror the significance of the junction of two rivers and the centralization of Cusco as the Templo Mayor does within the Aztec society.