How Did the Supreme Court Decision in Citizens United V

How did the Supreme Court decision in Citizens United v.FED (2010) affect the role of interest groups in political campaigns?

A) It legalized a new form of tax-exempt,nonparty group,the so-called 527 committee.
B) It limited groups such as unions and corporations from becoming directly involved in campaigns.
C) It prohibited groups from airing ads within 30 days of a general election.
D) It raised the maximum PAC contribution from $5,000 to $7,500.
E) It strengthened groups by allowing them to fund ads that expressly support candidates with unregulated funds.