A result of the Iranian hostage crisis was that
the hostages were never returned, even after President Carter left office.
President Carter won his reelection campaign in 1980
the hostages were freed in 1981 after President Reagan's inauguration
President Carter improved diplomatic relations with Iran.

The crisis in Iran boosted the prestige of Ayatollah Ruhollah Khomeini and the political authority of theocrats who resist normalization with the West. As a result of the crisis, the United States imposed economic sanctions on Iran, severely eroding relations between the two countries.

So, Option C is correct as this was the result of the Iranian hostage.

The other options are incorrect as:

Option A is incorrect as this statement is not true that the hostages never returned even after the carter left office.

Option B is incorrect as this statement is also not true that carter won his reelection campaign.

Option D is incorrect as it did not improved diplomatic relations with Iran.

Thus Option C is the correct statement as this is result of the Iranian hostage.

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