Answer:
c. Dreamtime.
Explanation:
According to my research on the cultural aspects of Australian Aboriginals, I can say that based on the information provided within the question they possessed a deep knowledge of the tribe's past in the Dreamtime. This is their understanding of the world around them, including it's creation as well as it's stories. They believe that from this came all knowledge and laws of existance, which must be observed and obeyed in order to survive.
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