The planets that reside in the region of the solar system are jupiter , uranus, and neptune. although these planets are made up of lighter elements, they have a solid core. the atmosphere of all these planets is made up of hydrogen and . in addition to these two elements, the planets neptune and contain methane.

The planets that reside in the Outer region of the solar system are Jupiter,

Saturn , Uranus, and Neptune. Although these planets are made up of lighter elements, they have a solid core. The atmosphere of all these planets is made up of hydrogen and helium  . In addition to these two elements, the planets Neptune and Uranus.

contain methane.

Explanation:

I mean Saturn would be right for the last one but it was not amongst the options so it would be Uranus

the methane gas [ CH4 ] would be found on Neptune and Uranus.