The correct answer is economist!
let's look at the other options:
anthropologist: studies people, their cultures and history for example
2) sociologists: studies society and the interaction of people in the society
4) political scientists study politics: political parties and international relations
Economists study markets and human behavior as buyers and sellers, and supply and demand!
It is saying that the army can’t demand and force you to accept them and feed them in your own house in war or peace but if you give them consent (permission) then they can.
