If the Sun Were Orbited by a Star of 1

Multiple Choice

If the Sun were orbited by a star of 1.8 solar masses at Jupiter's distance of 5.2 AU (or,more precisely,the Sun and the other star were orbiting each other 5.2 AU apart) ,what would be the orbital period of the system? (You might want to compare your answer with the actual orbital period of Jupiter,11.9 years.)

A) 7.1 years
B) 9.4 years
C) 50.2 years
D) 11.3 years