Final answer:
Jimmy Carter's status as an outsider to Washington politics was a key advantage during the 1976 presidential election, resonating with voters disillusioned by political corruption and contributing to his victory.
Step-by-step explanation:
An advantage of Jimmy Carter in the 1976 presidential election was A. He was an outsider to Washington politics. Carter ran an anti-Washington campaign, positioning himself as distinct from the corrupt politics of the nation's capital and the political establishment. This outsider status resonated with voters who were disillusioned with political corruption and scandals such as Watergate. Despite having less practical experience in executive leadership and the workings of the national government, Carter's image as a Washington outsider gave him an edge in the election, ultimately contributing to his victory over Gerald Ford.