Final answer:
Without the specific context of Ms. Hird's characterization, one cannot answer how she describes Aboriginal people. Historically, Australia's early 20th-century immigration policies targeted non-Europeans as undesirables to maintain a white society.
Step-by-step explanation:
The question does not provide enough context or information about Ms. Hird's characterization of Aboriginal people. To answer how Ms. Hird characterizes the Aboriginal people, we would need specific information or a source that outlines her views. However, regarding the historical context of Australia's immigration policies, in the early twentieth century, Australia aimed to exclude non-Europeans from immigrating to the continent through policies like the White Australia Policy. This was part of a broader preference for British and other European immigrants, with the goal of creating a homogenous white society. The correct answer to the historical context question provided is b. non-Europeans.