A thin metal disc of radius r floats on water surface and bends the surface downwards along the perimeter making an angle ø with the vertical edge of the disc . If the disc displaces a weight of water W and surface tension of water is T , then the weight of metal disc is
A) 2pie rT +W
B) 2pie r T cosø +W
C)2 pie r T cosø -W
D ) w-2 pie r T cosø