How many electoral votes are required to win the presidency in the United States?

How many electoral votes are required to win the presidency in the United States?
 
  a. 50
  b. 145
   c. 270
   d. 330

Question -2-

What is seen as an advantage of a proportional representation electoral system?
 
  a. It provides better representation for racial minorities and women.
   b. It lessens politicians' dependence on the party.
  c. It establishes a non-partisan government.
  d. It creates more voting opportunities for the average citizen.

Question -3-

Which of the following is true in regard to the federal voting system in the United States?
 
  a. Voting is compulsory.
  b. A win in an election is achieved through a plurality of the votes.
  c. Voter registration is unimportant.
  d. Majoritarian and proportional voting formulas are applied in different electoral tiers.