The correct answer is "offices of the Democratic National Committee."
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 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.