You Are Observing the Wobble of a Star Caused by the Orbit

Multiple Choice

You are observing the wobble of a star caused by the orbit of a planet around that star. Which property of this system listed below most significantly affects the period of that wobble?

A) the planet's orbital radius
B) the planet's mass
C) both the planet's orbital radius and its mass
D) neither the planet's orbital radius nor its mass