The correct answer is C) The break-in at the Watergate Hotel.
This break-in at the Watergate hotel was performed by a group of individuals that were trying to steal campaign secrets from the Democratic Party. The goal in this break-in was to help Nixon win a second term in office.
Ultimately, this lead to huge problems in the White House. The reason why this is the case is because President Nixon tried to do everything in his power to coverup this story and withhold information from the Supreme Court. Despite his best efforts, Nixon's records and tape recorded conversations were subopeaned and he resigned shortly after this scandal.