d. the range of power handed to the national government.
Explanation:
The main issue that divided the Federalists and the Anti-Federalists was the ratification of the Constitution. This was due to a deep disagreement when it came to the role of the national government, and the question of how much power this should have. On the one hand, the Federalists believed that the federal government should have significant power, and should be able to maintain the stability of the Union. On the other hand, the Anti-federalists worried that such power might lead to despotism, and instead wanted most power to be handed to the states.
As I am thinking you mean "Producers" when you say "Sellers" I am going to go with, Yes. You are correct it is Supply. (Also the other one is called Demand not price)
The basis of the American economy is a capitalistic environment in which people have a free market to encourage competition and prevent complete control over any one industry. The basis for any persons economy is trade and a free market in which they can buy and they can sell.