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Thiazolidinediones, a class of medications used in the management of type 2 diabetes, primarily lower blood sugar by decreasing insulin resistance. They work through the activation of peroxisome proliferator-activated receptors (PPARs), particularly PPAR-gamma, which plays a crucial role in the regulation of glucose and lipid metabolism. This action enhances the sensitivity of muscle and adipose tissue to insulin, allowing these tissues to more effectively utilize glucose. As a result, cells are better able to take up glucose from the bloodstream, leading to lower blood sugar levels.

In contrast, stimulating insulin production would involve another mechanism, typically associated with other classes of medications like sulfonylureas or certain GLP-1 receptor agonists. Enhancing glucose absorption also refers to yet another approach, which is not how thiazolidinediones function. Inhibiting glucose production in the liver is a characteristic of drugs such as metformin but is not the primary mechanism of thiazolidinediones. Therefore, the primary effect of thiazolidinediones focuses on reducing insulin resistance, making option B the correct choice.