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The correct response is based on the role of the hypothalamus in maintaining homeostasis, particularly in regulating body temperature. In brain-dead donors, the hypothalamus is no longer functioning due to the loss of brain activity and control, which results in an inability to maintain a stable body temperature.

The hypothalamus serves as the body’s thermostat, responding to changes in external temperature and initiating physiological responses to keep the body's temperature within a normal range. With its cessation of function in brain death, the body becomes unable to perform these critical regulatory functions, leading to potential hypothermia or hyperthermia.

While other brain structures like the cerebellum, cerebrum, and brainstem play vital roles in various bodily functions, they do not specifically control temperature regulation in the same direct manner as the hypothalamus. Hence, their cessation of activity does not directly impact the body's thermoregulation when compared to the critical functions performed by the hypothalamus.