The outer planets-jupiter, saturn, uranus, and neptune-are made up of which gases ?

The outer planets—Jupiter, Saturn, Uranus, and Neptune—are made up of mainly hydrogen, helium and nitrogen. Jupiter and Saturn are primarily made up of hydrogen and helium. However, while Uranus and Neptune are primarily composed of hydrogen and helium also, they consist of more ices and methane than Jupiter and Saturn.

Explanation:

hydrogen, helium, and ammonia

Explanation:

Hydrogen and helium are mentioned by other answer-givers here, and they are correct. But if you are asking this based off of Gradpoint, the only answer that provides these two gases is combined with ammonia.

b is the best answer for this question.