Velma's Rocket Ship Is Moving Away from Mort at a Speed

Multiple Choice

Velma's rocket ship is moving away from Mort at a speed of 0.75c. Mort fires a laser beam toward her spaceship, observing the tip of the laser beam to move away from him at speed c. Velma observes this laser beam to move past her at a speed of

A) 0.25c.
B) 1.25c.
C) 0.75c.
D) 1.75c.
E) None of the above.