The correct answer for number 1 is C) Nullification Doctrine.
Federalism is a political system in which federal, state, and local governments share power. Since this is the definition of federalism, the answer choice needs to be one where there is a problem between the state and federal government. A perfect example of this is the nullification doctrine, as this argued that states had the right to nullify (void) any federal laws they thought were unconstitutional.
2) The correct answer to number 2 is B) Nullification Doctrine.
Read the paragraph above for more information about nullification.
4) The correct answer to number 4 is D) Reserved powers.
Reserved powers are ones given to the states and not the federal government. These reserved powers are protected by the 10th amendment of the Us Constitution.