Essential to Breaking the Watergate Case Was the 1973 Testimony

Essential to breaking the Watergate case was the 1973 testimony before the Ervin committee of White House legal counsel John Dean. What did he testify?

A) that he had been paid to lie under oath previously
B) that John Ehrlichman had ordered the cover-up
C) that he had ordered the White House cover-up himself
D) that the president had personally ordered the Watergate break-in
E) that the president had approved a White House cover-up