You Discover a Binary Star System in Which Star a Has

Multiple Choice

You discover a binary star system in which star A has a velocity of 10 km/s and star B has a velocity of 30 km/s.If you study the system further and find out that the orbital period is 30 days and the orbital separation is 0.3 AU then what are the masses of stars A and B?

A) Star A is 3 M _$\bigodot$ and Star B is 1 M _$\bigodot$ .
B) Star A is 1 M _$\bigodot$ and Star B is 0.3 M _$\bigodot$ .
C) Star A is 6 M _$\bigodot$ and Star B is 2 M _$\bigodot$ .
D) Star A is 2 M _$\bigodot$ and Star B is 0.5 M _$\bigodot$ .