A solid cube of side a and density `rho_(0)` floats on the surface of a liquid of density `rho`. If the cube is slightly pushed downward, then it oscillates simple harmonically with a period of
A. `2pisqrt((ld)/(rhog))`
B. `2pisqrt((lrho)/(dg))`
C. `2pisqrt((ld)/((rho-d)g))`
D. `2pisqrt((lrho)/((rho-d)g))`
