<span>You should bring the following to the exam: two pencils, a bluebook, a calculator, and a dictionary.</span>
I don't know much about the Sydney mines, but from the context, I can infer that the tunnels were unsafe. Whether being that they were collapsing, or they were filled with poisonous gasses.
A is your answer to the question :)
The answer is A.true.hope this helps.
