Shells and corals of the sea contain calcium in the form of:

marble

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calcite

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aragonite

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iceland spar

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Solution

The correct option is C aragonite
Aragonite is a carbonate mineral, one of the three most common naturally occurring crystal forms of calcium carbonate, $C a C O_{3}$ (the other forms being the minerals calcite and vaterite). It is formed by biological and physical processes, including precipitation from marine and freshwater environments.
Shells and corals of the sea contain calcium in form of aragonite.
Hence option C is correct answer.

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