The bob of a simple pendulum executes simple harmonic motion in water with a period $t$, while the period of oscillation of the bob is $t_0$ is air. Neglecting frictional force of water and given that the density of the bob is $(\frac{4}{3}) \times 1000\; kg/m^3$. What relationship between $t$ and $t_0$ is true ?

Question

( A ) $t = t_0$
( B ) $t = 2t_0$
( C ) $t = t_0/2$
( D ) $t = 4t_0$