Correct Option: C

parapet (Noun) : a low wall along the edge of a bridge, a roof, etc. to stop people from falling
rampart (Noun) : a high wide wall of stone or earth with a path on top, built around a castle, town etc to defend it
ropeway (Noun) : a conveyance that transports passengers in carriers suspended from cables and supported by towers
staircase (Noun) : a set of stairs inside a building including the posts and rails
scaffold (Noun) : a platform used while executing criminals by cutting off their heads or hanging them from a rope; a structure made of poles and boards, for workers to stand on when they are working on a building