The correct descending order of the planets on the basis of their size from the given below

Correct option is C

The correct answer is (c).
Explanation
The descending order of these four planets based on their mean diameter is: Saturn > Uranus > Neptune > Earth.
Approximate diameters are:
· Saturn: 120,536 km
· Uranus: 51,118 km
· Neptune: 49,528 km
· Earth: 12,742 km
Therefore, the correct descending order is Saturn, Uranus, Neptune, Earth.
Additional Information
· Option {a} is incorrect because {Neptune is smaller than Uranus, so Neptune cannot come before Uranus}.
· Option {b} is incorrect because {Earth is much smaller than both Uranus and Neptune}.
· Option {d} is incorrect because {Saturn is the largest among the four planets, whereas Uranus cannot be placed before Saturn}.
· {Among all eight planets, Jupiter is the largest planet in the Solar System, followed by Saturn, Uranus, Neptune, Earth, Venus, Mars, and Mercury.}