In mammals, body temperature is controlled by a structure in the brain called the hypothalamus. The hypothalamus is able to sense even slight variations in body temperature. This structure is responsible for bodily responses that include thirst, the activation of sweat glands, and the dilation of blood vessels near the skin. Each of these mechanisms works to restore body temperature to a normal range.

Based on the information above, body temperature is controlled by a
A.
positive feedback loop that reverses a trend occurring in the body.
B.
negative feedback loop that reverses a trend occurring in the body.
C.
positive feedback loop that reinforces a trend occurring in the body.
D.
negative feedback loop that reinforces a trend occurring in the body.