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The primary function of water-reducing admixtures in concrete mixing is to reduce the water-cement ratio. These admixtures enable the use of less water while maintaining the desired workability of the concrete mix. By effectively lowering the water-cement ratio, the admixtures enhance the strength and durability of the concrete once it has cured. This is because a lower water-cement ratio typically leads to a denser and stronger concrete matrix.

While the other options touch on various aspects of concrete mixing and performance, they do not accurately capture the main role of water-reducing admixtures. Specifically, increasing the dryness of concrete, improving curing time, or enhancing concrete color are not direct functions of these admixtures. Instead, the focus of water-reducing agents is firmly on providing the necessary workability while reducing excess water, which ultimately benefits the overall quality of the finished concrete product.