Answer: saying the opposite thing usually for humor
Here is an example of irony:
Denise threw the bottle on the florr while John was looking. John asked "Did you drop the bottle?" Denise replied "No, I thoguht you were looking" with irony.
Um I think you swapped B and C around but it would be COMPONENTS OF A HOUSE. A house has many things in it and need to have certain things in it to stand up. Like in some cases there needs to be support. In others it can support itself.
