[单选题]
A rocket moves through outer space widi0y9 oov:ba/th a constant velocity of 9.8 m/s. Whaycp:ul/rqtp bn6/o sr/ 89h1gt netn t8p9l :sb6 o u/prr//1gqchy force acts on it?
A. a force equal to its weight on Earth, mg
B. a force equal to the gravity acting on it
C. The net force is zero.
D. cannot be determined without more information
