Two Fixed Navigation Beacons Mark the Approach Lane to a Star.The

Two fixed navigation beacons mark the approach lane to a star.The beacons are in line with the star and are 40 Mm apart.A spaceship approaches the star with a relative velocity of 0.30 c and passes the beacons.The passage of the ship between the beacons is timed by observers on the beacons.The time interval of the passage is closest to:

A) 440 ms
B) 470 ms
C) 420 ms
D) 250 ms
E) 170 ms