Uranus and Neptune are more dense than Saturn, but less dense than Earth. This tells us that:?

a. They have no atmospheres. b. They are composed mainly of rock. c. They are more massive than Saturn. d. They have larger fractions of hydrogen and helium than does Saturn. e. They have smaller fractions of hydrogen and helium than does Saturn. I think the answer is either (e) or (b). Your help would be... show more a. They have no atmospheres.
b. They are composed mainly of rock.
c. They are more massive than Saturn.
d. They have larger fractions of hydrogen and helium than does Saturn.
e. They have smaller fractions of hydrogen and helium than does Saturn.

I think the answer is either (e) or (b). Your help would be appreciated.

Thanks
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