Answer:
"As long as I live, I woll never by myself leave the path, to run into the wood, when my mother has forbidden me to do so."
The best paraphrase would be B.
(hope this helped!)
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.
Answer:
After he retires my grandfather plan to visit the base of Mount Everest and take a boat ride down the Amazon River
