Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle of 30° with each other. When suspended in a liquid of density 0.8 gcmˉ³, the angle remains the same. lf density of the material of the sphere is 1.6 gcmˉ³, the dielectric constant of the liquid is:
A. 3
B. 4
C. 2
D. 1