Please help with this astronomy question?

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Suppose a comet orbits the Sun on a highly eccentric orbit with an average (semimajor axis) distance of 1 AU. How long does it take to complete each orbit, and how do we know?

A.)It depends on the eccentricity of the orbit, as described by Kepler's first law.
B.) 1 year, which we know from Kepler's third law.
C.) Each orbit should take about 2 years, because the eccentricity is so large.
D.) It depends on the eccentricity of the orbit, as described by Kepler's second law.
 
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