An Astronaut Outside a Spaceship Hammers a Loose Rivet Back

Multiple Choice

An astronaut outside a spaceship hammers a loose rivet back in place. What happens to the astronaut as he swings the hammer?

A) Nothing. The spaceship takes up the momentum of the hammer.
B) He moves away from the spaceship.
C) He moves towards the spaceship.
D) He moves towards the spaceship as he pulls the hammer back and moves away from it as he swings the hammer forward.
E) He moves away from the spaceship as he pulls the hammer back and moves toward it as he swings the hammer forward.