Mort Observes Velma's Light- Clock, as Velma Passes

Multiple Choice

Mort observes Velma's light- clock, as Velma passes. He observes that, during a 1 second tick of her clock, her light beam travels

A) a distance of one light year.
B) further than 300,000 km.
C) 300,000 km.
D) less than 300,000 km.
E) no distance at all.