Super pacs have been criticized primarily for:
select one:

a. being a tool that provides unfair advantages to liberal democrats.
b. leveling the playing field for monetary influence in federal elections.
c. making it more likely that minor parties will gain control of government.
d. giving too much influence to the wealthy.
e. refusing to abide by fec regulations.

d. Giving too much influence to the wealthy.

Explanation:

Super PACs are a type of Political Action Committees, and PACs represent pools of campaing contributions and donates that money to the political candidates, in an United States elections. They channel funds for or against a candidate or a legislation.

Super PACs are officially known as independent-expenditure only committees, established in 2012. They engage in an unlimited political spending and are not tied to any political campaign. They can raise money from either individuals or corporations, and there are no legal limits on donation size. In that way, wealthy people can influence the outcome of the elections by spending unlimited amount of money for the support of their desired candidate.

is there a year set? the question is incomplete

answer; u.s senate;