A liquid is coming out from a vertical tube. The relation between the weight of the drop W, surface tension of the liquid T and radius of the tube r is given by, if the angle of contact is zero

• A

  $W=\pi r^{2}T$

• B

  $W=2\pi rT$

• C

  $W=2r^2\pi T$

• D

  $W=\frac{3}{4}\pi r^{3}T$