Which of the following describes a unitary system? a) a centralized system of government in which the subnational government is dependent on the central government, where substantial authority is concentrated
b) a dynamic in which states compete to attract business by lowering taxes and regulations, often to workers’ detriment
c) a strategy in which interest groups select the level and branch of government they calculate will be most receptive to their policy goals
d) a doctrine promoted by John Calhoun of South Carolina in the 1830s, asserting that if a state deems a federal law unconstitutional, it can nullify it within its borders