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Solutions that are homogeneous have a constant composition and set of characteristics. For instance, a cup of coffee, cologne, cough syrup, a salt- or sugar-water solution, etc.
Since cement, water, and numerous other additives are included in concrete, it serves as an illustration of a heterogeneous mixture. As a result, it is not expected that concrete will have a consistent composition throughout. As a result, choice (a) is correct.
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