The Period of a Planetary Orbit About a Star Is

Multiple Choice

The period of a planetary orbit about a star is one Earth year, whereas the average distance between the planet and the star is 1.5 AU (astronomical units) . A second planet is orbiting the star at a distance of 6.0 AU. The period of the second planet orbiting the same star is

A) 4.0 years.
B) 6.0 years.
C) 8.0 years.
D) unknown; the period cannot be determined from the information given.