What was the effect of carter’s attempts to free the hostages in iran? the hostages were returned to the united states immediately. the united states increased its purchase of iranian oil. all of carter’s attempts failed. the sandinistas were overthrown.

The correct answer is C. All of Carter's attempts failed.

Explanation:

The taking of hostages at the US embassy in Iran in 1979 lasted 444 days, between 1979 and 1981. It all began on November 4, 1979, when between 300 and 400 Islamist students jumped over the wall that surrounded the building from the US embassy in Tehran and, after defeating the Marines who were guarding him, they settled in place without letting anyone go.

64 hostages, handcuffed and blindfolded, were distributed in different buildings of the complex. After the release of a dozen of them, 52 remained in captivity.  The Islamists demanded the extradition of the Shah, Mohammed Pahlavi, protected by the United States and who had left the country eight months earlier, after the Islamic revolution evicted him from power.  

The kidnappers remained firm during the 14 months of the hostages taking, which ended on January 20, 1981, when President Ronald Reagan, Jimmy Carter's successor, took office, to which the Islamic authorities refused to make concessions. Even though the negotiation was not successful because two rescue operations were failed, and that was one of the reasons for his non-re-election, President Carter achieved liberation on the last day of his term as emissary of the Reagan administration.

- "it was a failure that was an embarrassment for the kennedy administration."

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the answer would be c