Name the planet which is least dense among all the planets in our solar system. 

Planets with a higher density are considered to be denser planets. The ratio between an object's mass and volume is known as its density. An object is said to be dense if it has a high density. The less dense things are those with a low density.
The solar system is the gravitational system that contains the Sun and its planet. As a result of the Sun's gravitational pull, the planets of the solar system revolve around it. The Sun is surrounded by eight planets. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune are the planets in order of appearance.

Saturn is the planet with the lowest density. Saturn is the solar system's icy planet. It has frosty rings encircling it. Saturn's density is lower than that of water. The water's density is$$1\text{kg/}{\text{m}}^{\text{3}}$$. Density of Saturn is $0.658\text{kg/}{\text{m}}^{\text{3}}$.

Hence, the correct answer is option C.