The correct answer is "executive privilege could not be used to prevent evidence from being heard in criminal proceedings."
In the United States v. Nixon, the Supreme Court ruled that executive privilege could not be used to prevent evidence from being heard in criminal proceedings. This means that Nixon could not keep the Watergate tapes under “executive privilege. So we can say that the decision of the Supreme Court meant that the executive branch should not have more power than other branches of government.
In 1972, the Watergate scandal began with a break-in at offices of the Democratic National Committee.
Yes, the Watergate Scandal started when a group of people break-in at the offices of the Democratic National Committee on June 17, 1972. The office was at the Watergate complex located in Washington D.C. The police found the thieves wiretapping telephones and caught them taking documents from the office. Two journalists from the Washington Post Newspaper revealed that US President Richard Nixon had connections with the incident. Their names: Carl Bernstein and Bob Woodward.