The second bigges A. lowest density

B. density equal to water

C. highest density

D. density equal to earth

Saturn is the second biggest planet and it has lowest density among all planets in the solar system. It is made up of hydrogen and helium and its density is even lower than the density of water.

Density of earth is highest among all planets in the solar system. Earth is quite denser as compared to Saturn therefore density of Saturn can’t be equivalent to earth.

Therefore correct option is (a) lowest density.