The correct answer is D) All of the above. This is the correct answer because during a prolonged period in a raft in tropical waters, the procedures that should be used include: keeping the entrance curtains open to allow ventilation, getting plenty of rest to conserve energy, and wetting clothes during the day to decrease perspiration and prevent dehydration. All of these measures are important for survival in a raft in a tropical environment. The other options are incorrect because they do not address the key considerations for prolonged raft survival in tropical conditions, such as maintaining ventilation, managing fatigue, and preventing dehydration.