The Inca and Aztec empires were heavily impacted by European exploration and colonization. The first impact was that when Europeans reached the Americas, the Incas and Aztecs were conquered which killed thousands of them and enslaved the ones that survived.
Isolating your self from others
The answer is: The Silk Road.
The Theory of Mass Dissemination suggested that fashion moves horizontally among social classes rather than vertically.
So the correct answer is C.
Hope this helps,
Davinia.