The period of oscillation of a simple pendulum is given by \[T=2\pi \sqrt{\frac{l}{g}}\]where l is about 100 cm and is known to have 1mm accuracy. The period is about 2s. The time of 100 oscillations is measured by a stop watch of least count 0.1 s. The percentage error in g is

• A.            0.1%                                         
• B.            1%
• C.            0.2%                                         
• D.            0.8%