Although she had been known as an effective legislator first in the Texas Senate and later
in the United States House of Representatives, not until Barbara Jordan’s participation in
the hearings on the impeachment of President Richard Nixon in 1974 was she made a
nationally recognized figure, as it was televised nationwide.

A. later in the United States House of Representatives, not until Barbara Jordan’s
participation in the hearings on the impeachment of President Richard Nixon in
1974 was she made a nationally recognized figure, as it was
B. later in the United States House of Representatives, Barbara Jordan did not
become a nationally recognized figure until 1974, when she participated in the
hearings on the impeachment of President Richard Nixon, which were
C. later in the Untied States House of Representatives, it was not until 1974 that
Barbara Jordan became a nationally recognized figure, with her participation in
the hearings on the impeachment of President Richard Nixon, which was
D. then also later in the United States House of Representatives, not until 1974 did
Barbara Jordan become a nationally recognized figure, as she participated in the
hearings on the impeachment of President Richard Nixon, being
E. then also later in the United States House of Representatives, Barbara Jordan did
not become a nationally recognized figure until 1974, when she participated in the
hearings on the impeachment of President Richard Nixon, which was



not quite sure what "which were" from answer B is refering to. I feel like it could as well be refering to the two events mentioned in the beginning of the sentence, therefore the clarity is the issue here. Could someone else please clarify ?

thank you for the reply, it helped