A car is moving in a circular horizontal track of radius 10 m with a constant speed of 10 m/s. A bob is suspended from the roof of the car by a light wire of length 1.0 m. The angle made by the wire with the vertical is

• A. \[0{}^\circ \]  
• B. \[\frac{\pi }{3}\]
• C. \[\frac{\pi }{6}\]  
• D. \[\frac{\pi }{4}\]