Answer:
The statement that describes the involvement of the United States in the Iran hostage crisis is "c- Failed diplomatic negotiations decreased public support for President Carter."
Step-by-step explanation:
In 1979, Iranian students seized the U.S. embassy in Tehran and took 52 American hostages. The crisis lasted for 444 days and the U.S. attempts to negotiate diplomatic settlements failed. This failure decreased public support for President Jimmy Carter, who was running for re-election in 1980.