Nation's credit. Fiat currency is a currency like the Dollar or Pound, where a government says it has value, it's not something that does actually have value like gold or silver. The value is determined based on the nation's credit.
The answer to the question is D
To punish the colonists for their disobedience
I think the answer is the first one
State law, not federal, regulates most aspects of the elections, including primaries, the eligibility of voters (beyond the basic constitutional definition), the running of each state's electoral college, and the running of state and local elections. The United States Constitution defines (to a basic extent) how the elections of federal officials are conducted in each state, in Article One and Article Two and various amendments.