Which set lists the four outer, gaseous planets?

Which set lists the four outer, gaseous planets?

• A. Jupiter, Neptune, Saturn, Uranus
• B. Jupiter, Saturn, Uranus, Neptune
• C. Saturn, Jupiter, Uranus, Neptune
• D. Neptune, Jupiter, Saturn, Uranus

Answer: (A)

The main idea is recognizing which planets sit in the outer region of the solar system and noting that, when listing a group, the order doesn’t matter. The four outer planets are Jupiter, Saturn, Uranus, and Neptune. In a set, the arrangement is not important, only that all four are included. So a listing that contains exactly those four planets, even in a different order, correctly represents the four outer planets. Jupiter and Saturn are classic gas giants, while Uranus and Neptune are often described as ice giants, but they belong in this outer, distant group with substantial gaseous envelopes.