Two solid spheres A and B of equal volumes but of different densities $$d_A$$ and $$d_B$$ are connected by a string. They are fully immersed in a fluid of density $$d_F$$. They get arranged into an equilibrium state as shown in the figure with a tension in the string. The arrangement is possible only if

A

$$d_A < d_F$$

B

$$d_B > d_F$$

C

$$d_A > d_F$$

D

$$d_A + d_B = 2 d_F$$