Which of the following are signs a diver is suffering from hypothermia?

The indicators of hypothermia include shivering, confusion, slurred speech, and abnormal behavior, which align with the body's response to cold exposure. Shivering is a natural reaction to generate body heat, while confusion and slurred speech often arise as the body's temperature drops significantly, affecting normal cognitive function and muscle control. Abnormal behavior can stem from both the physical and psychological impacts of hypothermia, which may impair judgment.

In contrast to the other possibilities, none exhibit the combination of symptoms typically associated with this condition. For example, feeling hot and intoxicated does not relate to hypothermia but instead suggests an entirely different condition, possibly hyperthermia or alcohol intoxication, which would be inconsistent with the physiological effects of prolonged exposure to cold. Blue skin and inability to swim are serious symptoms, but they are not complete indicators of hypothermia without the accompanying cognitive effects. Similarly, increased energy contradicts the lethargy and physical limitations experienced as hypothermia progresses. Thus, the breadth and specificity of symptoms in the correct choice make it the defining representation of hypothermia's impact on a diver.