Beginning with the 2010 election, corporations were free to run ads directly advocating a candidate's election for the first time since 1907, when congress first banned using general corporate funds in federal election campaigns. this occurred based on which 2010 u. s. supreme court decision?

Citizens United v. Federal Election Commission.

Explanation:

In the Citizens United v. Federal Election Commission, 558 U.S. 310 (2010) case, the Bipartisan Campaign Reform Act that prohibited any investments in political campaigns by businesses and labor organizations, was a violation of the protection of free speech guaranteed by the First Amendment.

Before that, the Tillman Act of 1907 had been the first legislation to ban financial contribution from corporations to political campaigns.

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a would be the answer