An Astronaut ,Floating Alone in Outer Space,throws a Baseball

An astronaut ,floating alone in outer space,throws a baseball.If the ball floats away at a speed of 20 meters per second,the astronaut will

A) move in the opposite direction at a speed of 20 m/s.
B) move in the opposite direction,but at a lower speed.
C) move in the opposite direction but at a higher speed.
D) not move as stated in any of the above choices.