Densest planet of the solar system
A
Correct answer
Explanation
Earth is the densest planet in our solar system with an average density of about 5.52 g/cm³. This high density is due to Earth's large iron-nickel core and relatively small size. Venus is slightly less dense at 5.24 g/cm³, while Mars is only 3.93 g/cm³ and Pluto is far less dense at about 1.86 g/cm³.