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질문 내용 : 06.
The Aborigines of modern-day Australia have the oldest continuously existing culture in the world. The Aborigins are believed to have arrived on the continent in 50,000 BC, and dating procedures done on stone tools and paint fragments found by archaeologists confirm this estimate. However, DNA evidence tracing the genetic drift between cultures is suggesting an even earlier arrival date for these indigenous Australians of around 70,000 BC. At peak levels, aboriginal Australia boasted a population of over 750,000, before being colonized by the British population level to drop nearly 80 percent.

Q. Which of the following is correct according to the passage?

a. Genetic evidence suggests an earlier date for the foundation of Aboriginal culture.
b. Indigenous Australians have the oldest human culture to ever exist.
c. DNA testing indicates the Aborigines arrived 20,000 years later than previously thought.
d. The arrival of the British caused a jump in the population of Aborigines답이 a인건 이해가 되겠는데 첫문장을 통해서 답이 b인것도 알수있는데 왜 b는 답이안되는지 설명좀 부탁드리겟습니다.