A certain number of spherical drops of a liquid of radius r coalesce to form a single drop of radius R and volume V. IF T is the surface tension of the liquid is
A ) energy =3vT (1/r-1/R) is relased
B) energy is neither released nor absorbed
C) energy =4vT (1/r-1/R) is released
D) energy = 3vT (1/r+1/R) is absorbed.'