Compared with Jupiter and Saturn,Uranus and Neptune contain proportionally more heavy materials,more ices,and less hydrogen.How do we account for this?
A) Jupiter and Saturn migrated inward early during their formation, leaving substantial quantities of heavy materials and ices behind (to form Uranus and Neptune) but taking most of the hydrogen.
B) Neptune and Uranus were formed far out in the solar system, where the materials were different from those in the present location of the outer planets (where Jupiter and Saturn were formed).
C) The heavy materials are from asteroids flung outward by the inward migration of the gas planets, the ices are from icy masses that had spiraled in from far out in the solar system, and the deficit of hydrogen was caused by the prior formation of the gas planets.
D) The heavy materials and ices are from asteroids flung outward by the inward migration of the gas planets, and the hydrogen deficit is because the light gases were blown out of the solar system by the solar wind.

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The Answer of Compared with Jupiter and Saturn,Uranus and Neptune contain proportionally more heavy materials,more ices,and less hydrogen.How do we account for this?
A) Jupiter and Saturn migrated inward early during their formation, leaving substantial quantities of heavy materials and ices behind (to form Uranus and Neptune) but taking most of the hydrogen.
B) Neptune and Uranus were formed far out in the solar system, where the materials were different from those in the present location of the outer planets (where Jupiter and Saturn were formed).
C) The heavy materials are from asteroids flung outward by the inward migration of the gas planets, the ices are from icy masses that had spiraled in from far out in the solar system, and the deficit of hydrogen was caused by the prior formation of the gas planets.
D) The heavy materials and ices are from asteroids flung outward by the inward migration of the gas planets, and the hydrogen deficit is because the light gases were blown out of the solar system by the solar wind.

Compared with Jupiter and Saturn,Uranus and Neptune Contain Proportionally More