An Asteroidlike Object (Or a Cometary Nucleus) Is Seen to Be

Multiple Choice

An asteroidlike object (or a cometary nucleus) is seen to be orbiting the Sun in a circular path with a period of 120 years. What is its distance of closest approach to Earth (the separation distance when the object is at opposition) ? (Be careful with your answer; a diagram might be helpful.)

A) 1314.5 au
B) 24.33 au
C) 25.33 au
D) 23.33 au