The bob of a simple pendulum is displaced from its equilibrium position O to a position Q which is at height h above O and the bob is then released. Assuming the mass of the bob to be m and time period of oscillations to be 2.0 sec, the tension in the string when the bob passes through O is

• A

  $\mathrm{m}(\mathrm{g}+\mathrm{\pi }\sqrt{2\mathrm{gh}})$

• B

  $\mathrm{m}(\mathrm{g}+\sqrt{{\mathrm{\pi }}^2\mathrm{gh}})$

• C

  $\mathrm{m}(\mathrm{g}+\sqrt{\frac{{\mathrm{\pi }}^2}{2}\mathrm{gh}})$

• D

  $\mathrm{m}(\mathrm{g}+\sqrt{\frac{{\mathrm{\pi }}^2}{3}\mathrm{gh}})$