i dont get this question...
Voldemort trying to get the stone, but Harry stopping him.
To provide possibly past events in the songs or to give information to the people watching or help to pass the time and make it a little fun and not so depressing when times are ruff. Kinda hard to explain it's more so of what your view of the songs and the scenario of which the song starts.
D. Break. because breach means a gap in a wall or barrier. in this case a gap in the firewall.
Actually its an adjective