Answer:
When they act against their common interests and/or threaten the safety of the people without cause. Basically, if they cause unecessary harm to the people of that country or state etc.
Explanation:
I think the answer would be D
Let's say you have a chicken and you want to trade said chicken for a cow. A barter economy means that you have to find someone who has a cow and wants a chicken. You must rely on a person coincidentally wanting a chicken but has a cow.
Established by Article I of the Constitution, the Legislative Branch consists of the House of Representatives and the Senate, which together form the United States Congress.