If You Were Standing on Pluto,how Often Would You See

If you were standing on Pluto,how often would you see the satellite Charon rise above the horizon each day?

A) once each 6-hour day as Pluto rotates on its axis
B) twice each 6-hour day because Charon is in a retrograde orbit
C) once every 2 days because Charon orbits in the same direction Pluto rotates but more slowly
D) never because -Charon is a synchronous satellite with an orbital period exactly equal to Pluto''s rotation period