Which of the following is a sign of shock?

A sign of shock is pale or clammy skin because shock results in reduced blood flow and oxygen to the skin and extremities. This physiological response often leads to the skin losing its warmth and moisture, appearing pale or cool and clammy to the touch. Recognizing this sign is critical for diagnosing shock, as it indicates that the body is not adequately circulating blood. The other options do not indicate shock; increased energy levels and excited behavior can reflect a heightened state of arousal rather than distress, while a slight fever may suggest an infection or other medical issue, rather than shock itself.