Which statement best describes the characteristics of carbon monoxide?

Carbon monoxide is indeed an odorless gas, which is one of its most dangerous characteristics, making it difficult for individuals to detect its presence until symptoms of poisoning become apparent. It binds with hemoglobin in the blood more effectively than oxygen, leading to severe hypoxia as it reduces the blood's ability to transport oxygen to tissues and organs. This can result in a variety of symptoms, including headaches, dizziness, weakness, confusion, and in severe cases, loss of consciousness or death.

The other options present information that does not accurately reflect the properties or effects of carbon monoxide. While it is true that some gases may be produced by electric furnaces, carbon monoxide is mainly generated from burning fossil fuels, particularly in improperly ventilated spaces. The statement regarding flu-like symptoms is misleading because, while symptoms can mimic flu (such as headache and malaise), carbon monoxide exposure does not typically cause a higher fever. Lastly, carbon monoxide poisoning can occur quickly and does not take several days for toxic levels to accumulate in the body; symptoms can appear within minutes to hours of exposure.