It is Machu Picchu. It is a several-centuries old Inca citadel. It was a major ceremonial and religious site for the worship of important Inca deities. It´s located in the eastern mountain range of southern Peru, region of Cuzco.
I honestly think it is c because this book I am guessing is a fiction book. Besides, you didn't provide us with the passage needed to solve your question. That is all I can do.