Since 1952, there have been an equal number of Democratic and Republican presidents. Beyond party ...

Since 1952, there have been an equal number of Democratic and Republican presidents. Beyond party identification, the main factor that accounts for this is __________.
 
  a. candidate appeal
  b. electoral appeal
  c. platform appeal
 d. party appeal

Question -2-

Why do small interest groups have an easier time enrolling potential members than large interest groups?
 
  a. In a small group, any individual's share of the collective good may be great enough to make it rational for him or her to join.
  b. In a small group, only individuals who contribute to the group's efforts can enjoy the collective good.
  c. Small groups are able to offer material incentives, whereas large groups are not.
 d. Unlike large groups, small groups often receive the help of patrons in recruiting members.

Question -3-

What type of group is a trade association?
 
  a. a governmental unit
  b. a public interest group
 c. an economic interest group
  d. a labor union