C (sand mixed with water)
Explanation:
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A heterogeneous mixture is a mixture of two or more compounds. Examples are: mixtures of sand and water or sand and iron filings, a conglomerate rock, water and oil, a salad, trail mix, and concrete (not cement).
Heterogeneous mixtures are mixtures where all elements and components have different properties and the composition is non-uniform; they appear to be completely different to the eye, as we can see the various components that make up the mixture.
