Question

which of the following is a common trait of all the outer (jovian / gas giant) planets?

they have both many moons and ring systems around them.

they have many moons.

none of the listed answers; saturn has rings while the rest have many moons.

they have ring systems around them.

Explanation:

All the outer (Jovian/Gas Giant) planets (Jupiter, Saturn, Uranus, Neptune) have many moons. While Saturn is most famous for its prominent rings, Jupiter, Uranus, and Neptune also have ring systems (though less prominent). But the key common trait among all of them is having many moons.

Answer:

They have many moons.