The matallic bob of a simple pendulum has the relative density `rho`. The time period of this pendulum is `T` it the metallic bob is immersed in water the new time period is given by
A. `T(rho-1)/(rho)`
B. `T(rho)/(rho-1)`
C. `Tsqrt((rho-1)/(rho))`
D. `Tsqrt((rho)/(rho-1))`