How does hypothermia affect a casualty?

Hypothermia is a medical condition that occurs when the body loses heat faster than it can produce it, resulting in a significant drop in core body temperature. This drop in temperature can lead to various physiological and psychological effects, including confusion and disorientation. As the body temperature declines, vital organs may begin to function improperly, and cognitive functions can be impaired, leading to confusion in the casualty's state of mind. This makes option B the correct choice, as it accurately reflects how hypothermia lowers body temperature and contributes to confusion in the affected individual.

The other outcomes presented in the other choices do not align with the physiological responses associated with hypothermia. While increasing heart rate, excessive sweating, or raising body temperature might relate to other conditions, they are not relevant to hypothermia itself, which is characterized by low body temperature and may lead to complications like confusion rather than increased physiological processes like heart rate or sweating.