Correct Answer:
Option A - The descending order of planet by size is as follows.
Jupiter> Saturn> Neptune> Uranus> Earth> Venus> Mars> Mercury.
The descending order of planet according to mass is as follows.
Jupiter> Saturn> Uranus> Neptune> Earth> Uranus> Mars> Mercury.
Therefore clear that mars is the smallest planet among the given options.
A. The descending order of planet by size is as follows.
Jupiter> Saturn> Neptune> Uranus> Earth> Venus> Mars> Mercury.
The descending order of planet according to mass is as follows.
Jupiter> Saturn> Uranus> Neptune> Earth> Uranus> Mars> Mercury.
Therefore clear that mars is the smallest planet among the given options.