The Outer Radius of the Saturnian Ring System Is About

The outer radius of the Saturnian ring system is about 274,000 km, whereas the outer radius of Jupiter's ring system is about 222,000 km. How does the period of the outermost particles in Jupiter's rings compare with the period of the outermost particles in Saturn's rings?

A) For Jupiter the period is about 39% of the period for Saturn.
B) For Jupiter the period is about 73% of the period for Saturn.
C) For Jupiter the period is about 81% of the period for Saturn.
D) For Jupiter the period is about 123% of the period for Saturn.