A drop of some liquid of volume `0.04 cm^3` is placed on the surface of a glass slide. Then another glass slide is placed on it in such a way that the liquid forms a thin layer of area `20 cm^2` between the surfaces of the two slides. To separate the slides a force of `16 xx 10^5` dyne has to be applied normal to the surfaces. The surface tension of the liquid is (in dyne-`cm^(-1)`)

Options

A. 60
B. 0
C. 80
D. 90