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The first step is to understand the role of the anterior pituitary gland within the endocrine system. The anterior pituitary gland is an important regulator of various hormonal functions in the body.

Next, we will review the provided options and see which one most closely aligns with the primary function of hormones produced by the anterior pituitary gland. a. Regulate growth: While some hormones produced by the anterior pituitary gland do regulate growth, this is not their primary function. b. Regulate the sleep cycle: The anterior pituitary gland has a limited role in regulating the sleep cycle, and it is not the main function of most of its hormones. c. Regulate production of other hormones: Most of the hormones produced by the anterior pituitary gland are indeed involved in regulating the production of other hormones. d. Regulate blood volume and blood pressure: Although some hormones may be indirectly involved in the regulation of blood volume and blood pressure, this is not the primary function of most hormones produced by the anterior pituitary gland.

Based on the above analysis, the best answer is option (c) - most of the hormones produced by the anterior pituitary gland perform the function of regulating the production of other hormones.