"A. by organizing strikes and protests" The power in any labor union lies in its ability for form protests and strikes, which can force the company to give in to their demands.
During the time of the Tang Dynasty in the 600's AD China could have become a major colonizer of western hemisphere due to their strong hold on ship building and navigational technologies. They had a huge manpower and all the resources, still they chose to not colonize the world. By 1400's China had tremendous maritime technologies and had enormous fleets at hand for their several voyage expeditions that took place till 1433, but they did not colonize the world as it was against the nature of the historical Chinese states to not explore, to not colonize or to not expand outside its sphere of influence in East Asia.
I think the correct answer among the choices listed above is option C. The power of Congress to declare war is an enumerated power. This type of power is a Constitution limit to the power of the Congress. Hope this answers the question.
