What Happened to Richard Nixon After He Resigned from the Presidency

Multiple Choice

What happened to Richard Nixon after he resigned from the presidency?

A) He was convicted of obstruction of justice but received a suspended sentence.
B) He ran for the Republican nomination for governor of California but was defeated by Ronald Reagan.
C) He was pardoned by President Ford for any and all crimes committed while in office.
D) He became the American ambassador to China during the Ford administration.
E) He taught politics and government at Harvard University.