A body dropped from a height h onto the floor makes elastic collision with the floor. The frequency of oscillation of its periodic motion is

• A

  $\frac{1}{2}\sqrt{\frac{\mathrm{g}}{2\mathrm{h}}}$

• B

  $\frac{1}{2}\sqrt{\frac{2\mathrm{h}}{\mathrm{g}}}$

• C

  $\frac{1}{2\mathrm{\pi }}\sqrt{\frac{\mathrm{g}}{2\mathrm{h}}}$

• D

  $2\mathrm{\pi }\sqrt{\frac{\mathrm{g}}{2\mathrm{h}}}$