Consider two identical cylinders (each of mass $m$,density $\rho_0$,horizontal cross-section area $s$) in equilibrium,partially submerged in two containers filled with liquids of densities $\rho_1$ and $\rho_2$ as shown in the figure. Find the period of small oscillations of this system about its equilibrium. Neglect the changes in the level of liquids in the containers. Neglect the mass of the strings. The acceleration due to gravity is $g$. ($v$ is the volume of each block).

• A
  $T = 2\pi \sqrt {\frac{{2v}}{{gs}}\,\frac{{{\rho _0}}}{{\left( {{\rho _1} + {\rho _2}} \right)}}} $
• B
  $T = 2\pi \sqrt {\frac{{2v}}{{gs}}\,\frac{{\left( {{\rho _1} + {\rho _2}} \right)}}{{{\rho _0}}}} $
• C
  $T = 2\pi \sqrt {\frac{v}{{2gs}}\,\frac{{\left( {{\rho _1} + {\rho _2}} \right)}}{{{\rho _0}}}} $
• D
  $T = 2\pi \sqrt {\frac{v}{{2gs}}\,\frac{{{\rho _0}}}{{\left( {{\rho _1} + {\rho _2}} \right)}}} $