They imprisoned him as an act of stopping treason upon the government.
The correct answer should be A. Exposition.
Expositions are usually located at the beginning of a play and are used to show not only the conflict that is happening, but some other points like the characters and the setting.
You should email your teacher and tell her/him what happened
or
ask your friend to borrow his/her book
Australia is a place of exile for those who dont fit
B is the correct answer.
In this case, there are no personal experiences stated. There are also no interviews with marine biologists about the future of coral reefs. So, the answer is, indeed, B.
I hope this helps!