Answer :
Final answer:
The period of revolution for a comet with a given semi-major axis and eccentricity can be calculated using Kepler's third law, resulting in an approximate value of 38.2 years. The correct answer is B.
Explanation:
The period of revolution for a comet can be determined using Kepler's third law, which states that the square of the period of revolution is proportional to the cube of the semi-major axis of the orbit. Given a semi-major axis of 20.1 AU and an eccentricity of 0.84, we can calculate the period of the comet to be approximately 38.2 years.