A seems to be correct, although I'd want to know what "many" means.
50% —?
75% — ?
30% — ?
What happened to many Aborigines as a result of British settlement?
A. Many Aborigines died from disease.
B. The Aborigines willingly assimilated into British culture.
C. The British allowed the Aborigines to govern themselves.
D. The British paid Aborigine children who attended British schools.
2 answers
I am not sure, but I personally think it means like most, or more than 50%