A solid cube with coefficient of linear expansion o floats in a liquid whose coefficient of volume expansion is $\mathrm{\gamma }$. When both the solid and liquid are heated, then the solid does not sink or lift when

• A

  $\mathrm{\gamma }>3\mathrm{\alpha }$

• B

  $\mathrm{\gamma }>3/\mathrm{\alpha }$

• C

  $\mathrm{\gamma }=3\mathrm{\alpha }$

• D

  $\mathrm{\gamma }=\mathrm{\alpha }/3$