The correct answer is B) flood the affected area with water. For chemical burns, the immediate and most effective first aid treatment is to flood the affected area with large amounts of water. This rapidly dilutes and removes the chemical, stopping the burning process and preventing further damage. Flushing the burn with water is the priority to stop the chemical reaction. The other options are not the correct first aid for chemical burns. Applying ointment or a sterile dressing could trap the chemical and make the burn worse. Applying an ice pack is not recommended, as it could further damage the skin.