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Answer:
Rb > Ca > C
Explanation:
The order of decreasing atomic radius of the elements given is Rb > Ca > C.
Atomic radius of a substance is the half of the internuclear distance between two covalently bonded atoms of non-metallic elements or half of the distance between two nuclei in the solid state of metals.
Therefore, Rubidium from the choices has the greatest atomic radius and Carbon has the lowest.