S2's Orbital Radius of 950 A

Multiple Choice

S2's orbital radius of 950 A.U. and an orbital period of 15 years are most consistent with S2being a star:

A) passing within a light-year of our solar system.
B) orbiting a 4 million solar mass object in the center of our Galaxy.
C) with a mass 4 million times the mass of our Sun.
D) in a globular cluster that has a mass about 4 million times the mass of our Sun.
E) being sucked into the black hole in the center of our Galaxy.