Answer:
Geographic location
Explanation:
The Inca civilization occupied an enormous territory in South America. However, much of this territory was located in the Andes Mountains, in an environment that is not easy to farm. It was also a territory with a lot of geographical variations. Therefore, the types of goods and crops that they produced depended on the geographical location of the settlements. These differences encouraged trade between different Inca communities.
For centuries Europeans and Arabs had sailed around its coasts using as reference the visible points of the littoral and their knowledge of the depths (probes) in different places. When, at the end of the 15th century, the Portuguese and Castilians began their more distant voyages of exploration and discovery, their navigation instruments were:
They knew the limitations and errors of navigating by esteem. They also knew that the magnetic declination was not constant but varied with place and time. They knew that the polar star was not located just above the celestial pole and knew how to correct the error introduced in the measurement of latitude by observing nearby stars (the "guards").
It is not A. I just took the test.