If You Stay on Earth While a Friend Races Off

Multiple Choice

If you stay on Earth while a friend races off in a rocket at close to the speed of light,then,according to special relativity,you will see a clock on the rocket appear to tick more slowly than the one on your wall.If your friend looks back at your clock,then,according to the same theory,the friend will see your clock appear to tick:

A) at the same speed as the clock on the rocket.
B) faster than the clock on the rocket.
C) faster or slower than the clock on the rocket, depending on the direction of travel of the rocket compared with Earth.
D) slower than the clock on the rocket.