In a Distant Galaxy,a Planet Orbits Its Sun at a Distance

Multiple Choice

In a distant galaxy,a planet orbits its sun at a distance of 1.8 $\times$ 10¹² m with a period of 10⁸s.A second planet orbits the same sun at a distance of 9 v 10¹¹ m.What is the period of the second planet?

A) 5 $\times$ 10⁷ s
B) 2 $\times$ 10⁸ s
C) 0.35 $\times$ 10⁸ s
D) 2.8 $\times$ 10⁸ s
E) 5 $\times$ 10⁸ s