Answer:
Option: (D) To identify patterns of diffusion and their effect on the host country.
Explanation:
The geographer purpose of studying the pattern of migration is to look at the reasons for the people leaving their native country and migrating to the host country.
To check the migrant's effects on the host country, it would be useful to divide two groups according to their skills - highly educated and skilled labor. Migration would affect the country because they will help the host country to built-in a good shape by their skills and knowledge.
States create their own laws, states have their own constitution, land and county governments. The state law stands unless a federal law overwrites it. States have their own transportation departments (make the roads, plan the roads, repair the roads).
Are their any multiple answer's ?
I think the answer would be c
