Answer:
C.Comparing and contrasting
Step-by-step explanation:
Comparing and contrasting involves the use of a guide in the analysis of two phenomena. The guide in this case is the knowledge of historical population shifts. Reading the map helps in confirming the previous knowledge. This is usually done by comparing and contrasting the previous knowledge to the ones found on the map to check if there’s a correlation.
This is what makes comparing and contrasting to be the principle talked about .