Answer:
Roads to connect different parts of their empire is the correct answer.
Step-by-step explanation:
The Incas empire was located in the western coastal region of South America. In 1200 they evolved from a small tribe into an organised society under one ruler, he was called "the Inca". The Inca Pachachuti Yapanqui started program for conquest and within a span of hundred years it developed into an empire which stretched more than 3,000 kilometres and covered modern day Ecuador, Bolivia, Chile and northwest Argentina. They were famous for building roads and towns in the highest places from the sea level.