The light from a laser beam travels at a speed of 3,00,000,000 meters per second. How far can it be seen within 20 nano sec, assuming that there is no obstruction in between? (20 nano sec = 20 x 10−9 sec)

A. 3 m

B. 20 m

C. 6 m

D. 0.6 m

Answer: Option C