The length of string of a simple pendulum as measured by a meter scale was found to be $98.2 \;cm$ The diameter of the bob was measured by a vernier caliper and it was found to be $3.62\;cm$ The time for 10 oscillations was found to be 21.2 s What is the effective length of the pendulum

Question

$\begin{array}{1 1}(A)\;24\;cm \\(B)\;100\;cm \\(C)\;9.8 \;cm \\(D)\;2 \;cm \end{array} $