Which of the Following Assessments of the Carter Administration in 1980

Which of the following assessments of the Carter administration in 1980 is accurate?

A) Without his masterful resolution to the Iranian hostage crisis, Carter's reelection would have been doubtful.
B) Prior to Reagan's announcement that he was going to run for president, few Americans would have doubted Carter's reelection.
C) Only Carter's defeat in the 1980 election saved him from almost certain impeachment by a heavily Republican Congress.
D) Carter's approval ratings in 1980 had fallen lower than Nixon's at the time of his resignation.
E) Carter's bold boycott of the Moscow Olympics in protest over the invasion of Afghanistan dramatically improved his chances at reelection.