A thin metal disc of radius r floats on water surface and bends the surface downwards along the perimeter making an angle $\theta$ with 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

  $2\mathrm{\pi rT}+\mathrm{W}$

• B

  $2\mathrm{\pi rTcos\theta }-\mathrm{W}$

• C

  $\text{2}\mathrm{\pi }\text{rTcos}\mathrm{\theta }+\mathrm{W}$

• D

  $\mathrm{W}-2\mathrm{\pi rTcos\theta }$