What did the mccain-feingold bill attempt to outlaw? a. unregulated "soft money" raised by political parties that could be used to support candidates b. the president's ability to appoint a party's national committee chair c. the use of 527 committees to support candidates d. severe state restrictions that make it difficult for third-party candidates to register?

The appropriate response is A. The expanded part of soft money in crusade financing, by precluding national political gathering advisory groups from raising or spending any assets not subject as far as possible, notwithstanding for state and nearby races or issue discourse. 
The expansion of issue backing advertisements, by characterizing as "electioneering interchanges" communicate promotions that name a government competitor inside 30 days of an essential or gathering or 60 days of a general race, and precluding any such advertisement paid for by a partnership or paid for by a unincorporated substance utilizing any corporate or union general treasury stores.