C. they wanted a limited national government.
A unitary system posits all government power in a "unitary" or single place -- the central government. A federal system has power shared between the national government and the states' governments. The founding fathers of the United States wanted to avoid a system that looked like a monarchy, with all the powers centered on whomever was on the throne. They wanted checks and balances of power, to keep tyranny in any form from arising.
