Two spheres of volume $500\;cc$ each of relative density $0.6$ and $1.2 $ are connected by string and the combination is immersed in a liquid. The tension in the string is

Question

$\begin{array}{1 1} 3\;N \\ 1.5\;N \\ 0.3\;N \\ 0.15\;N \end{array} $