The period of oscillation of a simple pendulum is $T= 2 \pi \sqrt{\large\frac{L}{g}}$. Measured value of L is 20 cm known to 1 mm accuracy and time for 100 oscillations of the pendulum is found to be 90 s using a wrist watch of 1s resolution . The accuracy in the determination of g is :

Question

$\begin{array}{1 1} 3\% \\ 1\% \\ 5 \% \\ 2 \% \end{array}$