A solid cylinder of density $\rho_0$, cross-section area $A$ and length $l$ floats in a  liquid $\rho(> \rho_0)$ with its axis vertical, as shown. If it is slightly displaced downward  and released, the time period will be 
  • A$2\pi \sqrt {\frac{l}{g}} $
  • B$2\pi \sqrt {\frac{{{\rho _0}l}}{{\rho g}}} $
  • C$2\pi \sqrt {\frac{{{\rho}l}}{{\rho_0 g}}} $
  • D$2\pi \sqrt {\frac{l}{{2g}}} $
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