Why do interest groups offer campaign contributions to candidates?

Why do interest groups offer campaign contributions to candidates?
 
  a. Helping to elect candidates creates a relationship between the interest group and the elected official that the group may be able to exploit later.
  b. Helping to elect candidates is the easiest way to influence government policy.
  c. Through campaign contributions, interest groups are able to elect their own staff members to positions in government.
 d. Through campaign contributions, interest groups are able to offer input into the political party platforms.

Question -2-

Which amendment to the U.S. Constitution lowered the voting age to eighteen?
 
  a. Thirteenth
  b. Fifteenth
  c. Nineteenth
 d. Twenty-Sixth

Question -3-

Interest groups use __________ to obtain the specific language and deadlines of proposed regulations.
 
  a. amicus curiae briefs
 b. issue networks
  c. the Federal Register
  d. collective bargaining

Question -4-

Roughly what percentage of Americans vote in presidential elections?
 
  a. 20 percent
  b. 35 percent
  c. 55 percent
  d. 70 percent