Please help due in 5MINS!! Give two reasons why a long wave can pick up a signal despite the presence of hills and the curved surface of the Earth between it and the transmitting aerial.

Aprisoner is forced to go into one of three rooms, but he can choose which room. the first room is ablaze with fire. the second one is rigged with explosives that will go off as soon as he enters. the third contains a pair of lions who haven't eaten in years. which room should he choose to survive?