The reporters who broke the Watergate scandal were which two people?A) Carl Bernstein and Bob Woodward // B) John Ehrlichman and H.R. Haldeman...

Although all of the people mentioned in these options were
famous in the 1970s, the only ones who were reporters involved in the Watergate scandal
were Woodward and Bernstein.  For this reason, A is the only possible
answer.

Answers B and C are meant to confuse you because
the people mentioned in those answers were also involved in the Watergate scandal. 
However, all of those people were part of the Nixon Administration, not part of the
effort to reveal Watergate.  Frank Wills was also involved in the Watergate scandal
since he was the security guard who discovered the original burglary.  However, he was
not a reporter.

So, the only possible answer is
A.