A Comet in a Highly Elliptical Orbit Is Found to Have

Multiple Choice

A comet in a highly elliptical orbit is found to have a semimajor axis equal to one astronomical unit (AU) . According to Kepler's 3rd law, what would be the sidereal period of this comet

A) more than one year
B) one year
C) less than one year
D) 76 years; the same for every comet
E) Not enough information is given to determine this.