Which economic principle can be seen at work in the success of merchants such as levi strauss during the california gold rush? a. supply and demand b. balance of payments c. mergers and acquisitions d. division of labor

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.

declare war, appoint military officers, sign treaties, make alliances