Correct Answer:
Option A - The size of the planets in order from largest to smallest is Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars, Mercury. Therefore it is clear that Mars is the smallest planet among the given options.
A. The size of the planets in order from largest to smallest is Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars, Mercury. Therefore it is clear that Mars is the smallest planet among the given options.