The item that is false: C. No one involved in the scandal was ever punished.
See the other answerer's response regarding persons punished.
I'll here provide some overall context/detail regarding Watergate:
"Watergate" refers to efforts by persons working for President Nixon's reelection campaign to spy on their opponents at Democratic party headquarters, and subsequent efforts to cover up those crimes.
The first break-in attempt by burglars working on Nixon's behalf occurred in May, 1972, as persons connected to the Nixon reelection campaign broke into the Democratic National Committee office in the Watergate complex of buildings in Washington, DC. They were planting wire-taps on the Democrats' phone lines, and also stole copies of documents. When the wire-taps didn't work properly, they broke in again (in June) to try to fix the surveillance devices, but they were caught.
The formation of the "plumbers" actually preceded Watergate. They were a "special investigations" unit that the Nixon White House had set up in 1971 to stop the leaking of classified information. Members of this group were those then later involved in the Watergate break-in (among other activities).
An insider at the FBI who remained anonymous at the time, known only as "Deep Throat," began to give information concerning Watergate to reporters Bob Woodward and Carl Bernstein of the Washington Post. The Watergate scandal was not kept out of the press; indeed, it was the persistent investigative reporting by Woodward and Bernstein that brought the scandal to light and forced Congressional hearings. (Note: Years later it was revealed that Deep Throat was Mark Felt, who at the time was Associate Director of the FBI.)
Nixon's role in Watergate was especially in his efforts and those of members of his staff to cover up what had happened. Ultimately, the Watergate affair brought down the Nixon presidency. He resigned on August 9, 1974, in order to avoid impeachment. And the whole affair made Americans more distrusting of government.
