Direction: In the following questions, out of the four alternatives, choose the one which can be substituted for the given words/ sentence.
prop (N.) : a piece of wood, metal, etc. used for supporting SOMETHING or keeping it in position
scaffold (N.) : a platform used while executing criminals by cutting off their HEADS or HANGING them from a rope
lean-to (N.) : a small building with its roof leaning against the side of a large building, WALL or fence
RAFTER (N.) : one of the sloping pieces of wood that support a roof