How should a diver with shivering symptoms be treated?

A diver experiencing shivering symptoms is likely suffering from mild hypothermia, indicating that their body temperature is dropping. The correct approach, therefore, is to provide warmth and dry clothing. This action helps to raise their body temperature and prevents further heat loss, which is critical in avoiding more severe hypothermia.

Using dry clothing allows for insulation against the cold, while warmth can come from blankets or other heat sources as available. It's essential to prioritize warming the individual rather than keeping them in cold water, which can exacerbate their condition.

The other options would not effectively address the issue of hypothermia. Leaving the diver in the water may prolong their exposure to cold and worsen their situation. Continuing to dive is dangerous and counterproductive, as it can lead to further heat loss instead of promoting recovery. Ignoring the symptoms can lead to severe consequences, as it overlooks the need for urgent care in the face of hypothermia. Hence, providing warmth and dry clothing is the most effective and appropriate response in this situation.