Final answer:
Machu Picchu, an ancient Incan site, is primarily known for its ceremonial and residential functions. It is not typically seen as a Trading Center.
Step-by-step explanation:
Among the options provided, (c) Trading Center is NOT one of the commonly accepted functions of Machu Picchu. Historically, Machu Picchu is primarily understood to have served as a site of significant religious, ceremonial, and astronomical functions (options a and b), as well as a royal estate or residence of Inca nobility (option d). However, it was not a trading hub or commerce center due to its remote location and the lack of evidence supporting this claim.
Learn more about Machu Picchu