What was the effect of Carter’s attempts to free the hostages in Iran?

Carter tried to secure the release of the American hostages held in Iran through diplomacy and a 1980 rescue mission. The rescue mission failed, and the hostages remained captive until January 1981, after Carter had left office. Thus, the best choice is “All of Carter’s attempts failed”; they were not returned immediately, and the other choices are unrelated.

AI-written and checked against the verified answer.