What is the appropriate response if a rescuer finds an unresponsive diver?

Initiating buoyancy control and checking for responsiveness is essential in a rescue scenario involving an unresponsive diver. This step ensures the rescuer maintains safety in the water while assessing the situation. By achieving proper buoyancy, the rescuer can stabilize both themselves and the diver, preventing further risk of drowning or injury.

Checking for responsiveness is critical in determining the diver's condition and what subsequent actions are necessary. If the diver is unresponsive, this assessment will guide the rescuer to provide appropriate care, such as administering rescue breaths or starting CPR, depending on the situation.

Other options would either neglect the needed safety protocols or fail to provide immediate assistance to the diver, which can lead to fatal consequences. Immediate action is crucial in a rescue, and assessing the diver's responsiveness while ensuring both divers are buoyantly controlled is the most responsible approach.