The Moon Demos Is 23,500 Km from Mars and Orbits

Multiple Choice

The moon Demos is 23,500 km from Mars and orbits once every 30 hours 26 minutes.Assuming that it orbits in a circular path,what is its average speed?

A) 0 m/s
B) 215 m/s
C) 732 m/s
D) 1348 m/s
E) 53,210 m/s