On an exam, the prudent assumption would be that anything is dangerous.
Like you, I don't see how the wire could normally be energized if the switch is open, but maybe we only THINK the switch is open, or the wrong switch is open, or some ding-dong walked by and decided to turn on the lights. Or some moron wired the thing wrong and is switching the neutral wire. My electronics teacher told me that in the Navy, his buddy swore to him twice over the radio that the breaker was open, but he decided to check anyway and found the circuit was energized. His lesson was that when your life is on the line, always check.