A is correct. Ford acted through executive order to pardon Nixon for any wrongdoings committed during his presidency. This pardon was incredibly controversial as many Americans were quite upset and disillusioned by the actions of Nixon. Ford did this to help heal the country and prevent months, perhaps years, of investigation and trials.
This healing was vitally important as Ford also pulled the final troops from Vietnam making option D also correct. Final troops were pulled in 1975 and shortly after Saigon fell to the communists. It is under Ford's administration that Vietnam is "lost".
Ford made no radical changes in the US during his administration even as the economy began to suffer. Additionally he took no action with Vietnam draft dodgers.