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How is carbon monoxide poisoning primarily caused on boats?

  1. Sun exposure

  2. Drinking contaminated water

  3. Inhaling the gas

  4. Skin contact with the boat

The correct answer is: Inhaling the gas

Carbon monoxide poisoning on boats is primarily caused by inhaling the gas, not by other factors such as sun exposure, drinking contaminated water, or skin contact with the boat. It is important to note that carbon monoxide is a colorless and odorless gas, making it difficult to detect without proper carbon monoxide detectors on board. The other options may seem plausible, but are not the main cause of carbon monoxide poisoning on boats.