There is something unique about Mercury's composition, compared to the other terrestrial planetary bodies. Which of these best describes it?   a Mercury is, surprisingly, made mostly of ices that ought to evaporate that close to the Sun.   b Mercury has almost no metallic iron in it, being made of mostly mantle- and crustal-type rocks.   c Mercury has a much larger iron core than the other terrestrial planetary bodies.   d Mercury is made mostly of hydrogen and helium, much like the outer planets.

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A: This is true.

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Q: please answer this question

A: By analysing the question