What Did the "White House Tapes" Reveal

What did the "White House tapes" reveal?

A) the burglary at Democratic headquarters was simply a third-rate caper, and no one on the White House staff had been involved.
B) President Nixon had ordered a cover-up in the Watergate affair.
C) President Nixon had been having an affair with his secretary for three years.
D) President Nixon had attempted to halt the "dirty tricks" of his supporters but had failed.
E) Nixon had tried to steal the 1960 presidential election.