A cube with a mass `= 20 g` wettable water floats on the surface of water. Each face of the cube is `alpha = 3 cm` long. Surface tension of water is `70 dyn//cm`. The distance of the lower face of the cube from the surface of water is (`g= 980 cm s^(-12)`)
A. `2.3cm`
B. `4.6cm`
C. `9.7cm`
D. `12.7cm`