Final answer:
George McGovern opposed President Nixon in the 1972 presidential election. Hence the correct answer is option A
Step-by-step explanation:
In the 1972 presidential election, President Nixon was opposed by George McGovern from the Democratic Party. McGovern was a strong opponent of the Vietnam War and had the support of a diverse group of voters who desired change and an immediate end to the war.
However, McGovern's campaign promise to pardon draft evaders alienated many Americans. Richard Nixon ultimately narrowly edged out Hubert Humphrey, Johnson's vice president, in the election.
Hence the correct answer is option A