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The answer is 24carat gold .
Milk is a mixture of water, fats, etc. So it is not pure. Sea water is a mixture of water,salt,etc. So it is not pure. Soli is a mixture of fine peices of rocks, humus,etc. So it is not pure. But 24 carat of gold is entirely made of gold and hence pure.
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the right option is option D 24 carat gold..
That's what I wrote!