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The correct choice highlighting the body system that controls the activity of sweat glands and regulates body temperature is rooted in the role of the nervous system. The nervous system is responsible for receiving signals regarding body temperature and initiating responses to maintain homeostasis. Sweat glands are activated by the autonomic nervous system, specifically the sympathetic nervous system, which triggers sweat production when the body reaches temperatures that require cooling down. This process allows the body to dissipate heat through evaporative cooling when sweat evaporates from the skin's surface.

In contrast, the endocrine system primarily regulates slower processes through hormones rather than immediate responses like sweating. The muscular system is involved in body movement and does not directly regulate sweat production, while the skeletal system provides structure and protection but also has no role in managing gland activity or temperature regulation. Therefore, the nervous system is the key player in activating the sweat glands in response to temperature changes, making it the correct answer for this question.