The right option is; this planet is the least dense.
What she would know about a planet that is the second largest gas giant and has the largest rings is that this planet is the least dense.
The second largest gas giant is Saturn, and it is the sixth planet from the Sun. Saturn is the least dense as its density is the lowest when compared with the other planets. Saturn has the largest rings. It is surrounded by hundreds of rings that are composed of pieces of ice, rocks and dust. Saturn is situated between two other gas giants; Jupiter and Uranus and it contains very light gases (hydrogen and helium).
