Oodegeroo Noonuccal, formerly known as Kath Walker, was a prominent Aboriginal activist and poet, significant in advocating for indigenous rights.
Judith Wright, while an important poet, primarily focused on environmental issues rather than Aboriginal movements.
Jack Davis was also a prolific playwright and poet who addressed Aboriginal issues but not as significantly recognized as Noonuccal.
David Malouf and Kevin Gilbert had some influence, but their primary focus wasn't exclusively on Aboriginal activism.
Thus, B, C, and E represent the most significant contributions.