A car has a rear view mirror of focal length 20 cm. A truck 2 m broad and 1.6 m in height is overtaking the car with a relative speed of 15 km/hr. At the moment when the truck is 6 m behind the car, the car driver will see the image of the truck to be moving at a speed of

A

0.0043 m/s

B

0.13 m/s

C

0.21 m/s

D

4.17 m/s