A horizontal platform with an object placed on it is executing is $3.92 \times 10^{-3}$ what must least period of these oscillation , So that the object is not detached from the platform?

Question

$\begin{array}{1 1} 0.1256\;s \\ 0.13565\;s \\ 0.14565\;s \\ 0.15565\;s \end{array} $