Two simple pendulums, A and $B,$ are $e=2\mathrm{.}5m$ long, The riod of pendulum $A$ is $T.$ Pendulum $A$ is half as heavy $($hal the mass$)$ of pendulum $3.$ What is the period of pendulum $B?$

T$/2$

$T\sqrt[\phantom{2}]{2}$

$T$

$2T$

$\frac{T}{\sqrt[\phantom{2}]{2}}$