Final answer:
The movie created by Citizens United that led to the landmark Supreme Court case is "Hillary: The Movie".
Step-by-step explanation:
The specific movie created by Citizens United, which was central to the landmark Supreme Court case, is d) "Hillary: The Movie". This documentary was critical of then-presidential candidate Hillary Clinton and led to a legal battle over federal campaign finance laws. The resulting Supreme Court case, Citizens United v. Federal Election Commission, concluded in a 5-4 decision that the corporate spending limits imposed by the Bipartisan Campaign Reform Act (BCRA) violated the corporation's First Amendment rights, thus enabling corporations to make unlimited contributions to political action committees.