Which civilization developed along the spine of the Andes mountains, was rich in silver, gems, and gold, and built its capital city of Cuzco in a fertile valley?

a. Maya

b. Aztec. Inca

d. Olmec

The Andes are a mountain chain in South America, so we can exclude the civilisations that developed in North America, such as the Aztec (central Mexico), the Maya (southern Mexico) and the Olmecs (South-central Mexico).

The correct answer is: the Inca.